DROP TABLE IF EXISTS t0,t1,t2,t3,t4,t5;
DROP VIEW IF EXISTS v1;
show variables where variable_name like "skip_show_database";
Variable_name	Value
skip_show_database	OFF
grant select, update, execute on test.* to mysqltest_2@localhost;
grant select, update on test.* to mysqltest_1@localhost;
create user mysqltest_3@localhost;
create user mysqltest_3;
select * from information_schema.SCHEMATA where schema_name > 'm';
CATALOG_NAME	SCHEMA_NAME	DEFAULT_CHARACTER_SET_NAME	DEFAULT_COLLATION_NAME	SQL_PATH
NULL	mysql	latin1	latin1_swedish_ci	NULL
NULL	test	latin1	latin1_swedish_ci	NULL
select schema_name from information_schema.schemata;
schema_name
information_schema
mysql
test
show databases like 't%';
Database (t%)
test
show databases;
Database
information_schema
mysql
test
show databases where `database` = 't%';
Database
create database mysqltest;
create table mysqltest.t1(a int, b VARCHAR(30), KEY string_data (b));
create table test.t2(a int);
create table t3(a int, KEY a_data (a));
create table mysqltest.t4(a int);
create table t5 (id int auto_increment primary key);
insert into t5 values (10);
create view v1 (c) as select table_name from information_schema.TABLES where table_name<>'ndb_binlog_index' AND table_name<>'ndb_apply_status';
select * from v1;
c
CHARACTER_SETS
COLLATIONS
COLLATION_CHARACTER_SET_APPLICABILITY
COLUMNS
COLUMN_PRIVILEGES
ENGINES
EVENTS
FILES
GLOBAL_STATUS
GLOBAL_VARIABLES
KEY_COLUMN_USAGE
PARTITIONS
PLUGINS
PROCESSLIST
REFERENTIAL_CONSTRAINTS
ROUTINES
SCHEMATA
SCHEMA_PRIVILEGES
SESSION_STATUS
SESSION_VARIABLES
STATISTICS
TABLES
TABLE_CONSTRAINTS
TABLE_PRIVILEGES
TRIGGERS
USER_PRIVILEGES
VIEWS
columns_priv
db
event
func
general_log
help_category
help_keyword
help_relation
help_topic
host
plugin
proc
procs_priv
servers
slow_log
tables_priv
time_zone
time_zone_leap_second
time_zone_name
time_zone_transition
time_zone_transition_type
user
t1
t4
t2
t3
t5
v1
select c,table_name from v1 
inner join information_schema.TABLES v2 on (v1.c=v2.table_name)
where v1.c like "t%";
c	table_name
TABLES	TABLES
TABLE_CONSTRAINTS	TABLE_CONSTRAINTS
TABLE_PRIVILEGES	TABLE_PRIVILEGES
TRIGGERS	TRIGGERS
tables_priv	tables_priv
time_zone	time_zone
time_zone_leap_second	time_zone_leap_second
time_zone_name	time_zone_name
time_zone_transition	time_zone_transition
time_zone_transition_type	time_zone_transition_type
t1	t1
t4	t4
t2	t2
t3	t3
t5	t5
select c,table_name from v1 
left join information_schema.TABLES v2 on (v1.c=v2.table_name)
where v1.c like "t%";
c	table_name
TABLES	TABLES
TABLE_CONSTRAINTS	TABLE_CONSTRAINTS
TABLE_PRIVILEGES	TABLE_PRIVILEGES
TRIGGERS	TRIGGERS
tables_priv	tables_priv
time_zone	time_zone
time_zone_leap_second	time_zone_leap_second
time_zone_name	time_zone_name
time_zone_transition	time_zone_transition
time_zone_transition_type	time_zone_transition_type
t1	t1
t4	t4
t2	t2
t3	t3
t5	t5
select c, v2.table_name from v1
right join information_schema.TABLES v2 on (v1.c=v2.table_name)
where v1.c like "t%";
c	table_name
TABLES	TABLES
TABLE_CONSTRAINTS	TABLE_CONSTRAINTS
TABLE_PRIVILEGES	TABLE_PRIVILEGES
TRIGGERS	TRIGGERS
tables_priv	tables_priv
time_zone	time_zone
time_zone_leap_second	time_zone_leap_second
time_zone_name	time_zone_name
time_zone_transition	time_zone_transition
time_zone_transition_type	time_zone_transition_type
t1	t1
t4	t4
t2	t2
t3	t3
t5	t5
select table_name from information_schema.TABLES
where table_schema = "mysqltest" and table_name like "t%";
table_name
t1
t4
select * from information_schema.STATISTICS where TABLE_SCHEMA = "mysqltest";
TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	NON_UNIQUE	INDEX_SCHEMA	INDEX_NAME	SEQ_IN_INDEX	COLUMN_NAME	COLLATION	CARDINALITY	SUB_PART	PACKED	NULLABLE	INDEX_TYPE	COMMENT
NULL	mysqltest	t1	1	mysqltest	string_data	1	b	A	NULL	NULL	NULL	YES	BTREE	
show keys from t3 where Key_name = "a_data";
Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment
t3	1	a_data	1	a	A	NULL	NULL	NULL	YES	BTREE	
show tables like 't%';
Tables_in_test (t%)
t2
t3
t5
show table status;
Name	Engine	Version	Row_format	Rows	Avg_row_length	Data_length	Max_data_length	Index_length	Data_free	Auto_increment	Create_time	Update_time	Check_time	Collation	Checksum	Create_options	Comment
t2	MyISAM	10	Fixed	0	0	0	#	1024	0	NULL	#	#	NULL	latin1_swedish_ci	NULL		
t3	MyISAM	10	Fixed	0	0	0	#	1024	0	NULL	#	#	NULL	latin1_swedish_ci	NULL		
t5	MyISAM	10	Fixed	1	7	7	#	2048	0	11	#	#	NULL	latin1_swedish_ci	NULL		
v1	NULL	NULL	NULL	NULL	NULL	NULL	#	NULL	NULL	NULL	#	#	NULL	NULL	NULL	NULL	VIEW
show full columns from t3 like "a%";
Field	Type	Collation	Null	Key	Default	Extra	Privileges	Comment
a	int(11)	NULL	YES	MUL	NULL		select,insert,update,references	
show full columns from mysql.db like "Insert%";
Field	Type	Collation	Null	Key	Default	Extra	Privileges	Comment
Insert_priv	enum('N','Y')	utf8_general_ci	NO		N		select,insert,update,references	
show full columns from v1;
Field	Type	Collation	Null	Key	Default	Extra	Privileges	Comment
c	varchar(64)	utf8_general_ci	NO				select,insert,update,references	
select * from information_schema.COLUMNS where table_name="t1"
and column_name= "a";
TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	COLUMN_NAME	ORDINAL_POSITION	COLUMN_DEFAULT	IS_NULLABLE	DATA_TYPE	CHARACTER_MAXIMUM_LENGTH	CHARACTER_OCTET_LENGTH	NUMERIC_PRECISION	NUMERIC_SCALE	CHARACTER_SET_NAME	COLLATION_NAME	COLUMN_TYPE	COLUMN_KEY	EXTRA	PRIVILEGES	COLUMN_COMMENT
NULL	mysqltest	t1	a	1	NULL	YES	int	NULL	NULL	10	0	NULL	NULL	int(11)			select,insert,update,references	
show columns from mysqltest.t1 where field like "%a%";
Field	Type	Null	Key	Default	Extra
a	int(11)	YES		NULL	
create view mysqltest.v1 (c) as select a from mysqltest.t1;
grant select (a) on mysqltest.t1 to mysqltest_2@localhost;
grant select on mysqltest.v1 to mysqltest_3;
select table_name, column_name, privileges from information_schema.columns 
where table_schema = 'mysqltest' and table_name = 't1';
table_name	column_name	privileges
t1	a	select
show columns from mysqltest.t1;
Field	Type	Null	Key	Default	Extra
a	int(11)	YES		NULL	
b	varchar(30)	YES	MUL	NULL	
select table_name, column_name, privileges from information_schema.columns
where table_schema = 'mysqltest' and table_name = 'v1';
table_name	column_name	privileges
v1	c	select
explain select * from v1;
ERROR HY000: EXPLAIN/SHOW can not be issued; lacking privileges for underlying table
drop view v1, mysqltest.v1;
drop tables mysqltest.t4, mysqltest.t1, t2, t3, t5;
drop database mysqltest;
select * from information_schema.CHARACTER_SETS
where CHARACTER_SET_NAME like 'latin1%';
CHARACTER_SET_NAME	DEFAULT_COLLATE_NAME	DESCRIPTION	MAXLEN
latin1	latin1_swedish_ci	cp1252 West European	1
SHOW CHARACTER SET LIKE 'latin1%';
Charset	Description	Default collation	Maxlen
latin1	cp1252 West European	latin1_swedish_ci	1
SHOW CHARACTER SET WHERE charset like 'latin1%';
Charset	Description	Default collation	Maxlen
latin1	cp1252 West European	latin1_swedish_ci	1
select * from information_schema.COLLATIONS
where COLLATION_NAME like 'latin1%';
COLLATION_NAME	CHARACTER_SET_NAME	ID	IS_DEFAULT	IS_COMPILED	SORTLEN
latin1_german1_ci	latin1	5		#	1
latin1_swedish_ci	latin1	8	Yes	#	1
latin1_danish_ci	latin1	15		#	1
latin1_german2_ci	latin1	31		#	2
latin1_bin	latin1	47		#	1
latin1_general_ci	latin1	48		#	1
latin1_general_cs	latin1	49		#	1
latin1_spanish_ci	latin1	94		#	1
SHOW COLLATION LIKE 'latin1%';
Collation	Charset	Id	Default	Compiled	Sortlen
latin1_german1_ci	latin1	5		#	1
latin1_swedish_ci	latin1	8	Yes	#	1
latin1_danish_ci	latin1	15		#	1
latin1_german2_ci	latin1	31		#	2
latin1_bin	latin1	47		#	1
latin1_general_ci	latin1	48		#	1
latin1_general_cs	latin1	49		#	1
latin1_spanish_ci	latin1	94		#	1
SHOW COLLATION WHERE collation like 'latin1%';
Collation	Charset	Id	Default	Compiled	Sortlen
latin1_german1_ci	latin1	5		#	1
latin1_swedish_ci	latin1	8	Yes	#	1
latin1_danish_ci	latin1	15		#	1
latin1_german2_ci	latin1	31		#	2
latin1_bin	latin1	47		#	1
latin1_general_ci	latin1	48		#	1
latin1_general_cs	latin1	49		#	1
latin1_spanish_ci	latin1	94		#	1
select * from information_schema.COLLATION_CHARACTER_SET_APPLICABILITY
where COLLATION_NAME like 'latin1%';
COLLATION_NAME	CHARACTER_SET_NAME
latin1_german1_ci	latin1
latin1_swedish_ci	latin1
latin1_danish_ci	latin1
latin1_german2_ci	latin1
latin1_bin	latin1
latin1_general_ci	latin1
latin1_general_cs	latin1
latin1_spanish_ci	latin1
drop procedure if exists sel2;
drop function if exists sub1;
drop function if exists sub2;
create function sub1(i int) returns int
return i+1;
create procedure sel2()
begin
select * from t1;
select * from t2;
end|
select parameter_style, sql_data_access, dtd_identifier 
from information_schema.routines;
parameter_style	sql_data_access	dtd_identifier
SQL	CONTAINS SQL	NULL
SQL	CONTAINS SQL	int(11)
show procedure status;
Db	Name	Type	Definer	Modified	Created	Security_type	Comment
test	sel2	PROCEDURE	root@localhost	#	#	DEFINER	
show function status;
Db	Name	Type	Definer	Modified	Created	Security_type	Comment
test	sub1	FUNCTION	root@localhost	#	#	DEFINER	
select a.ROUTINE_NAME from information_schema.ROUTINES a,
information_schema.SCHEMATA b where
a.ROUTINE_SCHEMA = b.SCHEMA_NAME;
ROUTINE_NAME
sel2
sub1
explain select a.ROUTINE_NAME from information_schema.ROUTINES a,
information_schema.SCHEMATA b where
a.ROUTINE_SCHEMA = b.SCHEMA_NAME;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	#	ALL	NULL	NULL	NULL	NULL	2	
1	SIMPLE	#	ALL	NULL	NULL	NULL	NULL	2	Using where
select a.ROUTINE_NAME, b.name from information_schema.ROUTINES a,
mysql.proc b where a.ROUTINE_NAME = convert(b.name using utf8) order by 1;
ROUTINE_NAME	name
sel2	sel2
sub1	sub1
select count(*) from information_schema.ROUTINES;
count(*)
2
create view v1 as select routine_schema, routine_name from information_schema.routines 
order by routine_schema, routine_name;
select * from v1;
routine_schema	routine_name
test	sel2
test	sub1
drop view v1;
select ROUTINE_NAME, ROUTINE_DEFINITION from information_schema.ROUTINES;
ROUTINE_NAME	ROUTINE_DEFINITION
show create function sub1;
ERROR 42000: FUNCTION sub1 does not exist
select ROUTINE_NAME, ROUTINE_DEFINITION from information_schema.ROUTINES;
ROUTINE_NAME	ROUTINE_DEFINITION
sel2	NULL
sub1	NULL
grant all privileges on test.* to mysqltest_1@localhost;
select ROUTINE_NAME, ROUTINE_DEFINITION from information_schema.ROUTINES;
ROUTINE_NAME	ROUTINE_DEFINITION
sel2	NULL
sub1	NULL
create function sub2(i int) returns int
return i+1;
select ROUTINE_NAME, ROUTINE_DEFINITION from information_schema.ROUTINES;
ROUTINE_NAME	ROUTINE_DEFINITION
sel2	NULL
sub1	NULL
sub2	return i+1
show create procedure sel2;
Procedure	sql_mode	Create Procedure
sel2		NULL
show create function sub1;
Function	sql_mode	Create Function
sub1		NULL
show create function sub2;
Function	sql_mode	Create Function
sub2		CREATE DEFINER=`mysqltest_1`@`localhost` FUNCTION `sub2`(i int) RETURNS int(11)
return i+1
show function status like "sub2";
Db	Name	Type	Definer	Modified	Created	Security_type	Comment
test	sub2	FUNCTION	mysqltest_1@localhost	#	#	DEFINER	
drop function sub2;
show create procedure sel2;
Procedure	sql_mode	Create Procedure
sel2		CREATE DEFINER=`root`@`localhost` PROCEDURE `sel2`()
begin
select * from t1;
select * from t2;
end
create view v0 (c) as select schema_name from information_schema.schemata;
select * from v0;
c
information_schema
mysql
test
explain select * from v0;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	#	ALL	NULL	NULL	NULL	NULL	2	
create view v1 (c) as select table_name from information_schema.tables
where table_name="v1";
select * from v1;
c
v1
create view v2 (c) as select column_name from information_schema.columns
where table_name="v2";
select * from v2;
c
c
create view v3 (c) as select CHARACTER_SET_NAME from information_schema.character_sets
where CHARACTER_SET_NAME like "latin1%";
select * from v3;
c
latin1
create view v4 (c) as select COLLATION_NAME from information_schema.collations
where COLLATION_NAME like "latin1%";
select * from v4;
c
latin1_german1_ci
latin1_swedish_ci
latin1_danish_ci
latin1_german2_ci
latin1_bin
latin1_general_ci
latin1_general_cs
latin1_spanish_ci
show keys from v4;
Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment
select * from information_schema.views where TABLE_NAME like "v%";
TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	VIEW_DEFINITION	CHECK_OPTION	IS_UPDATABLE	DEFINER	SECURITY_TYPE
NULL	test	v0	/* ALGORITHM=UNDEFINED */ select `schemata`.`SCHEMA_NAME` AS `c` from `information_schema`.`schemata`	NONE	NO	root@localhost	DEFINER
NULL	test	v1	/* ALGORITHM=UNDEFINED */ select `tables`.`TABLE_NAME` AS `c` from `information_schema`.`tables` where (`tables`.`TABLE_NAME` = _utf8'v1')	NONE	NO	root@localhost	DEFINER
NULL	test	v2	/* ALGORITHM=UNDEFINED */ select `columns`.`COLUMN_NAME` AS `c` from `information_schema`.`columns` where (`columns`.`TABLE_NAME` = _utf8'v2')	NONE	NO	root@localhost	DEFINER
NULL	test	v3	/* ALGORITHM=UNDEFINED */ select `character_sets`.`CHARACTER_SET_NAME` AS `c` from `information_schema`.`character_sets` where (`character_sets`.`CHARACTER_SET_NAME` like _utf8'latin1%')	NONE	NO	root@localhost	DEFINER
NULL	test	v4	/* ALGORITHM=UNDEFINED */ select `collations`.`COLLATION_NAME` AS `c` from `information_schema`.`collations` where (`collations`.`COLLATION_NAME` like _utf8'latin1%')	NONE	NO	root@localhost	DEFINER
drop view v0, v1, v2, v3, v4;
create table t1 (a int);
grant select,update,insert on t1 to mysqltest_1@localhost;
grant select (a), update (a),insert(a), references(a) on t1 to mysqltest_1@localhost;
grant all on test.* to mysqltest_1@localhost with grant option;
select * from information_schema.USER_PRIVILEGES where grantee like '%mysqltest_1%';
GRANTEE	TABLE_CATALOG	PRIVILEGE_TYPE	IS_GRANTABLE
'mysqltest_1'@'localhost'	NULL	USAGE	NO
select * from information_schema.SCHEMA_PRIVILEGES where grantee like '%mysqltest_1%';
GRANTEE	TABLE_CATALOG	TABLE_SCHEMA	PRIVILEGE_TYPE	IS_GRANTABLE
'mysqltest_1'@'localhost'	NULL	test	SELECT	YES
'mysqltest_1'@'localhost'	NULL	test	INSERT	YES
'mysqltest_1'@'localhost'	NULL	test	UPDATE	YES
'mysqltest_1'@'localhost'	NULL	test	DELETE	YES
'mysqltest_1'@'localhost'	NULL	test	CREATE	YES
'mysqltest_1'@'localhost'	NULL	test	DROP	YES
'mysqltest_1'@'localhost'	NULL	test	REFERENCES	YES
'mysqltest_1'@'localhost'	NULL	test	INDEX	YES
'mysqltest_1'@'localhost'	NULL	test	ALTER	YES
'mysqltest_1'@'localhost'	NULL	test	CREATE TEMPORARY TABLES	YES
'mysqltest_1'@'localhost'	NULL	test	LOCK TABLES	YES
'mysqltest_1'@'localhost'	NULL	test	EXECUTE	YES
'mysqltest_1'@'localhost'	NULL	test	CREATE VIEW	YES
'mysqltest_1'@'localhost'	NULL	test	SHOW VIEW	YES
'mysqltest_1'@'localhost'	NULL	test	CREATE ROUTINE	YES
'mysqltest_1'@'localhost'	NULL	test	ALTER ROUTINE	YES
'mysqltest_1'@'localhost'	NULL	test	EVENT	YES
'mysqltest_1'@'localhost'	NULL	test	TRIGGER	YES
select * from information_schema.TABLE_PRIVILEGES where grantee like '%mysqltest_1%';
GRANTEE	TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	PRIVILEGE_TYPE	IS_GRANTABLE
'mysqltest_1'@'localhost'	NULL	test	t1	SELECT	NO
'mysqltest_1'@'localhost'	NULL	test	t1	INSERT	NO
'mysqltest_1'@'localhost'	NULL	test	t1	UPDATE	NO
select * from information_schema.COLUMN_PRIVILEGES where grantee like '%mysqltest_1%';
GRANTEE	TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	COLUMN_NAME	PRIVILEGE_TYPE	IS_GRANTABLE
'mysqltest_1'@'localhost'	NULL	test	t1	a	SELECT	NO
'mysqltest_1'@'localhost'	NULL	test	t1	a	INSERT	NO
'mysqltest_1'@'localhost'	NULL	test	t1	a	UPDATE	NO
'mysqltest_1'@'localhost'	NULL	test	t1	a	REFERENCES	NO
delete from mysql.user where user like 'mysqltest%';
delete from mysql.db where user like 'mysqltest%';
delete from mysql.tables_priv where user like 'mysqltest%';
delete from mysql.columns_priv where user like 'mysqltest%';
flush privileges;
drop table t1;
create table t1 (a int null, primary key(a));
alter table t1 add constraint constraint_1 unique (a);
alter table t1 add constraint unique key_1(a);
alter table t1 add constraint constraint_2 unique key_2(a);
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` int(11) NOT NULL DEFAULT '0',
  PRIMARY KEY (`a`),
  UNIQUE KEY `constraint_1` (`a`),
  UNIQUE KEY `key_1` (`a`),
  UNIQUE KEY `key_2` (`a`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1
select * from information_schema.TABLE_CONSTRAINTS where
TABLE_SCHEMA= "test";
CONSTRAINT_CATALOG	CONSTRAINT_SCHEMA	CONSTRAINT_NAME	TABLE_SCHEMA	TABLE_NAME	CONSTRAINT_TYPE
NULL	test	PRIMARY	test	t1	PRIMARY KEY
NULL	test	constraint_1	test	t1	UNIQUE
NULL	test	key_1	test	t1	UNIQUE
NULL	test	key_2	test	t1	UNIQUE
select * from information_schema.KEY_COLUMN_USAGE where
TABLE_SCHEMA= "test";
CONSTRAINT_CATALOG	CONSTRAINT_SCHEMA	CONSTRAINT_NAME	TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	COLUMN_NAME	ORDINAL_POSITION	POSITION_IN_UNIQUE_CONSTRAINT	REFERENCED_TABLE_SCHEMA	REFERENCED_TABLE_NAME	REFERENCED_COLUMN_NAME
NULL	test	PRIMARY	NULL	test	t1	a	1	NULL	NULL	NULL	NULL
NULL	test	constraint_1	NULL	test	t1	a	1	NULL	NULL	NULL	NULL
NULL	test	key_1	NULL	test	t1	a	1	NULL	NULL	NULL	NULL
NULL	test	key_2	NULL	test	t1	a	1	NULL	NULL	NULL	NULL
select table_name from information_schema.TABLES where table_schema like "test%";
table_name
t1
select table_name,column_name from information_schema.COLUMNS where table_schema like "test%";
table_name	column_name
t1	a
select ROUTINE_NAME from information_schema.ROUTINES;
ROUTINE_NAME
sel2
sub1
delete from mysql.user where user='mysqltest_1';
drop table t1;
drop procedure sel2;
drop function sub1;
create table t1(a int);
create view v1 (c) as select a from t1 with check option;
create view v2 (c) as select a from t1 WITH LOCAL CHECK OPTION;
create view v3 (c) as select a from t1 WITH CASCADED CHECK OPTION;
select * from information_schema.views;
TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	VIEW_DEFINITION	CHECK_OPTION	IS_UPDATABLE	DEFINER	SECURITY_TYPE
NULL	test	v1	/* ALGORITHM=UNDEFINED */ select `test`.`t1`.`a` AS `c` from `test`.`t1`	CASCADED	YES	root@localhost	DEFINER
NULL	test	v2	/* ALGORITHM=UNDEFINED */ select `test`.`t1`.`a` AS `c` from `test`.`t1`	LOCAL	YES	root@localhost	DEFINER
NULL	test	v3	/* ALGORITHM=UNDEFINED */ select `test`.`t1`.`a` AS `c` from `test`.`t1`	CASCADED	YES	root@localhost	DEFINER
grant select (a) on test.t1 to joe@localhost with grant option;
select * from INFORMATION_SCHEMA.COLUMN_PRIVILEGES;
GRANTEE	TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	COLUMN_NAME	PRIVILEGE_TYPE	IS_GRANTABLE
'joe'@'localhost'	NULL	test	t1	a	SELECT	YES
select * from INFORMATION_SCHEMA.TABLE_PRIVILEGES;
GRANTEE	TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	PRIVILEGE_TYPE	IS_GRANTABLE
drop view v1, v2, v3;
drop table t1;
delete from mysql.user where user='joe';
delete from mysql.db where user='joe';
delete from mysql.tables_priv where user='joe';
delete from mysql.columns_priv where user='joe';
flush privileges;
create table t1 (a int not null auto_increment,b int, primary key (a));
insert into t1 values (1,1),(NULL,3),(NULL,4);
select AUTO_INCREMENT from information_schema.tables where table_name = 't1';
AUTO_INCREMENT
4
drop table t1;
create table t1 (s1 int);
insert into t1 values (0),(9),(0);
select s1 from t1 where s1 in (select version from
information_schema.tables) union select version from
information_schema.tables;
s1
10
drop table t1;
SHOW CREATE TABLE INFORMATION_SCHEMA.character_sets;
Table	Create Table
CHARACTER_SETS	CREATE TEMPORARY TABLE `CHARACTER_SETS` (
  `CHARACTER_SET_NAME` varchar(64) NOT NULL DEFAULT '',
  `DEFAULT_COLLATE_NAME` varchar(64) NOT NULL DEFAULT '',
  `DESCRIPTION` varchar(60) NOT NULL DEFAULT '',
  `MAXLEN` bigint(3) NOT NULL DEFAULT '0'
) ENGINE=MEMORY DEFAULT CHARSET=utf8
set names latin2;
SHOW CREATE TABLE INFORMATION_SCHEMA.character_sets;
Table	Create Table
CHARACTER_SETS	CREATE TEMPORARY TABLE `CHARACTER_SETS` (
  `CHARACTER_SET_NAME` varchar(64) NOT NULL DEFAULT '',
  `DEFAULT_COLLATE_NAME` varchar(64) NOT NULL DEFAULT '',
  `DESCRIPTION` varchar(60) NOT NULL DEFAULT '',
  `MAXLEN` bigint(3) NOT NULL DEFAULT '0'
) ENGINE=MEMORY DEFAULT CHARSET=utf8
set names latin1;
create table t1 select * from information_schema.CHARACTER_SETS
where CHARACTER_SET_NAME like "latin1";
select * from t1;
CHARACTER_SET_NAME	DEFAULT_COLLATE_NAME	DESCRIPTION	MAXLEN
latin1	latin1_swedish_ci	cp1252 West European	1
alter table t1 default character set utf8;
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `CHARACTER_SET_NAME` varchar(64) NOT NULL DEFAULT '',
  `DEFAULT_COLLATE_NAME` varchar(64) NOT NULL DEFAULT '',
  `DESCRIPTION` varchar(60) NOT NULL DEFAULT '',
  `MAXLEN` bigint(3) NOT NULL DEFAULT '0'
) ENGINE=MyISAM DEFAULT CHARSET=utf8
drop table t1;
create view v1 as select * from information_schema.TABLES;
drop view v1;
create table t1(a NUMERIC(5,3), b NUMERIC(5,1), c float(5,2),
d NUMERIC(6,4), e float, f DECIMAL(6,3), g int(11), h DOUBLE(10,3),
i DOUBLE);
select COLUMN_NAME,COLUMN_TYPE, CHARACTER_MAXIMUM_LENGTH, 
CHARACTER_OCTET_LENGTH, NUMERIC_PRECISION, NUMERIC_SCALE
from information_schema.columns where table_name= 't1';
COLUMN_NAME	COLUMN_TYPE	CHARACTER_MAXIMUM_LENGTH	CHARACTER_OCTET_LENGTH	NUMERIC_PRECISION	NUMERIC_SCALE
a	decimal(5,3)	NULL	NULL	5	3
b	decimal(5,1)	NULL	NULL	5	1
c	float(5,2)	NULL	NULL	5	2
d	decimal(6,4)	NULL	NULL	6	4
e	float	NULL	NULL	12	NULL
f	decimal(6,3)	NULL	NULL	6	3
g	int(11)	NULL	NULL	10	0
h	double(10,3)	NULL	NULL	10	3
i	double	NULL	NULL	22	NULL
drop table t1;
create table t115 as select table_name, column_name, column_type
from information_schema.columns where table_name = 'proc';
select * from t115;
table_name	column_name	column_type
proc	db	char(64)
proc	name	char(64)
proc	type	enum('FUNCTION','PROCEDURE')
proc	specific_name	char(64)
proc	language	enum('SQL')
proc	sql_data_access	enum('CONTAINS_SQL','NO_SQL','READS_SQL_DATA','MODIFIES_SQL_DATA')
proc	is_deterministic	enum('YES','NO')
proc	security_type	enum('INVOKER','DEFINER')
proc	param_list	blob
proc	returns	char(64)
proc	body	longblob
proc	definer	char(77)
proc	created	timestamp
proc	modified	timestamp
proc	sql_mode	set('REAL_AS_FLOAT','PIPES_AS_CONCAT','ANSI_QUOTES','IGNORE_SPACE','NOT_USED','ONLY_FULL_GROUP_BY','NO_UNSIGNED_SUBTRACTION','NO_DIR_IN_CREATE','POSTGRESQL','ORACLE','MSSQL','DB2','MAXDB','NO_KEY_OPTIONS','NO_TABLE_OPTIONS','NO_FIELD_OPTIONS','MYSQL323','MYSQL40','ANSI','NO_AUTO_VALUE_ON_ZERO','NO_BACKSLASH_ESCAPES','STRICT_TRANS_TABLES','STRICT_ALL_TABLES','NO_ZERO_IN_DATE','NO_ZERO_DATE','INVALID_DATES','ERROR_FOR_DIVISION_BY_ZERO','TRADITIONAL','NO_AUTO_CREATE_USER','HIGH_NOT_PRECEDENCE')
proc	comment	char(64)
drop table t115;
create procedure p108 () begin declare c cursor for select data_type
from information_schema.columns;  open c; open c; end;//
call p108()//
ERROR 24000: Cursor is already open
drop procedure p108;
create view v1 as select A1.table_name from information_schema.TABLES A1
where table_name= "user";
select * from v1;
table_name
user
drop view v1;
create view vo as select 'a' union select 'a';
show index from vo;
Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment
select * from information_schema.TABLE_CONSTRAINTS where
TABLE_NAME= "vo";
CONSTRAINT_CATALOG	CONSTRAINT_SCHEMA	CONSTRAINT_NAME	TABLE_SCHEMA	TABLE_NAME	CONSTRAINT_TYPE
select * from information_schema.KEY_COLUMN_USAGE where
TABLE_NAME= "vo";
CONSTRAINT_CATALOG	CONSTRAINT_SCHEMA	CONSTRAINT_NAME	TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	COLUMN_NAME	ORDINAL_POSITION	POSITION_IN_UNIQUE_CONSTRAINT	REFERENCED_TABLE_SCHEMA	REFERENCED_TABLE_NAME	REFERENCED_COLUMN_NAME
drop view vo;
select TABLE_NAME,TABLE_TYPE,ENGINE
from information_schema.tables 
where table_schema='information_schema' limit 2;
TABLE_NAME	TABLE_TYPE	ENGINE
CHARACTER_SETS	SYSTEM VIEW	MEMORY
COLLATIONS	SYSTEM VIEW	MEMORY
show tables from information_schema like "T%";
Tables_in_information_schema (T%)
TABLES
TABLE_CONSTRAINTS
TABLE_PRIVILEGES
TRIGGERS
create database information_schema;
ERROR 42000: Access denied for user 'root'@'localhost' to database 'information_schema'
use information_schema;
show full tables like "T%";
Tables_in_information_schema (T%)	Table_type
TABLES	SYSTEM VIEW
TABLE_CONSTRAINTS	SYSTEM VIEW
TABLE_PRIVILEGES	SYSTEM VIEW
TRIGGERS	SYSTEM VIEW
create table t1(a int);
ERROR 42S02: Unknown table 't1' in information_schema
use test;
show tables;
Tables_in_test
use information_schema;
show tables like "T%";
Tables_in_information_schema (T%)
TABLES
TABLE_CONSTRAINTS
TABLE_PRIVILEGES
TRIGGERS
select table_name from tables where table_name='user';
table_name
user
select column_name, privileges from columns
where table_name='user' and column_name like '%o%';
column_name	privileges
Host	select,insert,update,references
Password	select,insert,update,references
Drop_priv	select,insert,update,references
Reload_priv	select,insert,update,references
Shutdown_priv	select,insert,update,references
Process_priv	select,insert,update,references
Show_db_priv	select,insert,update,references
Lock_tables_priv	select,insert,update,references
Show_view_priv	select,insert,update,references
Create_routine_priv	select,insert,update,references
Alter_routine_priv	select,insert,update,references
max_questions	select,insert,update,references
max_connections	select,insert,update,references
max_user_connections	select,insert,update,references
use test;
create function sub1(i int) returns int
return i+1;
create table t1(f1 int);
create view v2 (c) as select f1 from t1;
create view v3 (c) as select sub1(1);
create table t4(f1 int, KEY f1_key (f1));
drop table t1;
drop function sub1;
select table_name from information_schema.views
where table_schema='test';
table_name
v2
v3
Warnings:
Warning	1356	View 'test.v2' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
Warning	1356	View 'test.v3' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
select table_name from information_schema.views
where table_schema='test';
table_name
v2
v3
Warnings:
Warning	1356	View 'test.v2' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
Warning	1356	View 'test.v3' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
select column_name from information_schema.columns
where table_schema='test';
column_name
f1
Warnings:
Warning	1356	View 'test.v2' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
Warning	1356	View 'test.v3' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
select index_name from information_schema.statistics where table_schema='test';
index_name
f1_key
select constraint_name from information_schema.table_constraints
where table_schema='test';
constraint_name
show create view v2;
View	Create View
v2	CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v2` AS select `test`.`t1`.`f1` AS `c` from `t1`
Warnings:
Warning	1356	View 'test.v2' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
show create table v3;
View	Create View
v3	CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v3` AS select `test`.`sub1`(1) AS `c`
Warnings:
Warning	1356	View 'test.v3' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
drop view v2;
drop view v3;
drop table t4;
select * from information_schema.table_names;
ERROR 42S02: Unknown table 'table_names' in information_schema
select column_type from information_schema.columns
where table_schema="information_schema" and table_name="COLUMNS" and
(column_name="character_set_name" or column_name="collation_name");
column_type
varchar(64)
varchar(64)
select TABLE_ROWS from information_schema.tables where 
table_schema="information_schema" and table_name="COLUMNS";
TABLE_ROWS
NULL
select table_type from information_schema.tables
where table_schema="mysql" and table_name="user";
table_type
BASE TABLE
show open tables where `table` like "user";
Database	Table	In_use	Name_locked
mysql	user	0	0
show status where variable_name like "%database%";
Variable_name	Value
Com_show_databases	3
show variables where variable_name like "skip_show_databas";
Variable_name	Value
show global status like "Threads_running";
Variable_name	Value
Threads_running	#
create table t1(f1 int);
create table t2(f2 int);
create view v1 as select * from t1, t2;
set @got_val= (select count(*) from information_schema.columns);
drop view v1;
drop table t1, t2;
use test;
CREATE TABLE t_crashme ( f1 BIGINT);
CREATE VIEW a1 (t_CRASHME) AS SELECT f1 FROM t_crashme GROUP BY f1;
CREATE VIEW a2 AS SELECT t_CRASHME FROM a1;
count(*)
68
drop view a2, a1;
drop table t_crashme;
select table_schema,table_name, column_name from
information_schema.columns 
where data_type = 'longtext';
table_schema	table_name	column_name
information_schema	COLUMNS	COLUMN_DEFAULT
information_schema	COLUMNS	COLUMN_TYPE
information_schema	EVENTS	EVENT_DEFINITION
information_schema	EVENTS	SQL_MODE
information_schema	GLOBAL_VARIABLES	VARIABLE_VALUE
information_schema	PARTITIONS	PARTITION_EXPRESSION
information_schema	PARTITIONS	SUBPARTITION_EXPRESSION
information_schema	PARTITIONS	PARTITION_DESCRIPTION
information_schema	PLUGINS	PLUGIN_DESCRIPTION
information_schema	PROCESSLIST	INFO
information_schema	ROUTINES	ROUTINE_DEFINITION
information_schema	ROUTINES	SQL_MODE
information_schema	SESSION_VARIABLES	VARIABLE_VALUE
information_schema	TRIGGERS	ACTION_CONDITION
information_schema	TRIGGERS	ACTION_STATEMENT
information_schema	TRIGGERS	SQL_MODE
information_schema	TRIGGERS	DEFINER
information_schema	VIEWS	VIEW_DEFINITION
select table_name, column_name, data_type from information_schema.columns
where data_type = 'datetime';
table_name	column_name	data_type
EVENTS	EXECUTE_AT	datetime
EVENTS	STARTS	datetime
EVENTS	ENDS	datetime
EVENTS	CREATED	datetime
EVENTS	LAST_ALTERED	datetime
EVENTS	LAST_EXECUTED	datetime
FILES	CREATION_TIME	datetime
FILES	LAST_UPDATE_TIME	datetime
FILES	LAST_ACCESS_TIME	datetime
FILES	CREATE_TIME	datetime
FILES	UPDATE_TIME	datetime
FILES	CHECK_TIME	datetime
PARTITIONS	CREATE_TIME	datetime
PARTITIONS	UPDATE_TIME	datetime
PARTITIONS	CHECK_TIME	datetime
ROUTINES	CREATED	datetime
ROUTINES	LAST_ALTERED	datetime
TABLES	CREATE_TIME	datetime
TABLES	UPDATE_TIME	datetime
TABLES	CHECK_TIME	datetime
TRIGGERS	CREATED	datetime
event	execute_at	datetime
event	last_executed	datetime
event	starts	datetime
event	ends	datetime
SELECT COUNT(*) FROM INFORMATION_SCHEMA.TABLES A
WHERE NOT EXISTS 
(SELECT * FROM INFORMATION_SCHEMA.COLUMNS B
WHERE A.TABLE_SCHEMA = B.TABLE_SCHEMA
AND A.TABLE_NAME = B.TABLE_NAME);
COUNT(*)
0
create table t1
( x_bigint BIGINT,
x_integer INTEGER,
x_smallint SMALLINT,
x_decimal DECIMAL(5,3),
x_numeric NUMERIC(5,3),
x_real REAL,
x_float FLOAT,
x_double_precision DOUBLE PRECISION );
SELECT COLUMN_NAME, CHARACTER_MAXIMUM_LENGTH, CHARACTER_OCTET_LENGTH
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_NAME= 't1';
COLUMN_NAME	CHARACTER_MAXIMUM_LENGTH	CHARACTER_OCTET_LENGTH
x_bigint	NULL	NULL
x_integer	NULL	NULL
x_smallint	NULL	NULL
x_decimal	NULL	NULL
x_numeric	NULL	NULL
x_real	NULL	NULL
x_float	NULL	NULL
x_double_precision	NULL	NULL
drop table t1;
grant select on test.* to mysqltest_4@localhost;
SELECT TABLE_NAME, COLUMN_NAME, PRIVILEGES FROM INFORMATION_SCHEMA.COLUMNS 
where COLUMN_NAME='TABLE_NAME';
TABLE_NAME	COLUMN_NAME	PRIVILEGES
COLUMNS	TABLE_NAME	select
COLUMN_PRIVILEGES	TABLE_NAME	select
FILES	TABLE_NAME	select
KEY_COLUMN_USAGE	TABLE_NAME	select
PARTITIONS	TABLE_NAME	select
REFERENTIAL_CONSTRAINTS	TABLE_NAME	select
STATISTICS	TABLE_NAME	select
TABLES	TABLE_NAME	select
TABLE_CONSTRAINTS	TABLE_NAME	select
TABLE_PRIVILEGES	TABLE_NAME	select
VIEWS	TABLE_NAME	select
delete from mysql.user where user='mysqltest_4';
delete from mysql.db where user='mysqltest_4';
flush privileges;
SELECT table_schema, count(*) FROM information_schema.TABLES where table_name<>'ndb_binlog_index' AND table_name<>'ndb_apply_status' GROUP BY TABLE_SCHEMA;
table_schema	count(*)
information_schema	27
mysql	22
create table t1 (i int, j int);
create trigger trg1 before insert on t1 for each row
begin
if new.j > 10 then
set new.j := 10;
end if;
end|
create trigger trg2 before update on t1 for each row
begin
if old.i % 2 = 0 then
set new.j := -1;
end if;
end|
create trigger trg3 after update on t1 for each row
begin
if new.j = -1 then
set @fired:= "Yes";
end if;
end|
show triggers;
Trigger	Event	Table	Statement	Timing	Created	sql_mode	Definer
trg1	INSERT	t1	begin
if new.j > 10 then
set new.j := 10;
end if;
end	BEFORE	NULL		root@localhost
trg2	UPDATE	t1	begin
if old.i % 2 = 0 then
set new.j := -1;
end if;
end	BEFORE	NULL		root@localhost
trg3	UPDATE	t1	begin
if new.j = -1 then
set @fired:= "Yes";
end if;
end	AFTER	NULL		root@localhost
select * from information_schema.triggers;
TRIGGER_CATALOG	TRIGGER_SCHEMA	TRIGGER_NAME	EVENT_MANIPULATION	EVENT_OBJECT_CATALOG	EVENT_OBJECT_SCHEMA	EVENT_OBJECT_TABLE	ACTION_ORDER	ACTION_CONDITION	ACTION_STATEMENT	ACTION_ORIENTATION	ACTION_TIMING	ACTION_REFERENCE_OLD_TABLE	ACTION_REFERENCE_NEW_TABLE	ACTION_REFERENCE_OLD_ROW	ACTION_REFERENCE_NEW_ROW	CREATED	SQL_MODE	DEFINER
NULL	test	trg1	INSERT	NULL	test	t1	0	NULL	begin
if new.j > 10 then
set new.j := 10;
end if;
end	ROW	BEFORE	NULL	NULL	OLD	NEW	NULL		root@localhost
NULL	test	trg2	UPDATE	NULL	test	t1	0	NULL	begin
if old.i % 2 = 0 then
set new.j := -1;
end if;
end	ROW	BEFORE	NULL	NULL	OLD	NEW	NULL		root@localhost
NULL	test	trg3	UPDATE	NULL	test	t1	0	NULL	begin
if new.j = -1 then
set @fired:= "Yes";
end if;
end	ROW	AFTER	NULL	NULL	OLD	NEW	NULL		root@localhost
drop trigger trg1;
drop trigger trg2;
drop trigger trg3;
drop table t1;
create database mysqltest;
create table mysqltest.t1 (f1 int, f2 int);
create table mysqltest.t2 (f1 int);
grant select (f1) on mysqltest.t1 to user1@localhost;
grant select on mysqltest.t2 to user2@localhost;
grant select on mysqltest.* to user3@localhost;
grant select on *.* to user4@localhost;
select * from information_schema.column_privileges order by grantee;
GRANTEE	TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	COLUMN_NAME	PRIVILEGE_TYPE	IS_GRANTABLE
'user1'@'localhost'	NULL	mysqltest	t1	f1	SELECT	NO
select * from information_schema.table_privileges order by grantee;
GRANTEE	TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	PRIVILEGE_TYPE	IS_GRANTABLE
select * from information_schema.schema_privileges order by grantee;
GRANTEE	TABLE_CATALOG	TABLE_SCHEMA	PRIVILEGE_TYPE	IS_GRANTABLE
select * from information_schema.user_privileges order by grantee;
GRANTEE	TABLE_CATALOG	PRIVILEGE_TYPE	IS_GRANTABLE
'user1'@'localhost'	NULL	USAGE	NO
show grants;
Grants for user1@localhost
GRANT USAGE ON *.* TO 'user1'@'localhost'
GRANT SELECT (f1) ON `mysqltest`.`t1` TO 'user1'@'localhost'
select * from information_schema.column_privileges order by grantee;
GRANTEE	TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	COLUMN_NAME	PRIVILEGE_TYPE	IS_GRANTABLE
select * from information_schema.table_privileges order by grantee;
GRANTEE	TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	PRIVILEGE_TYPE	IS_GRANTABLE
'user2'@'localhost'	NULL	mysqltest	t2	SELECT	NO
select * from information_schema.schema_privileges order by grantee;
GRANTEE	TABLE_CATALOG	TABLE_SCHEMA	PRIVILEGE_TYPE	IS_GRANTABLE
select * from information_schema.user_privileges order by grantee;
GRANTEE	TABLE_CATALOG	PRIVILEGE_TYPE	IS_GRANTABLE
'user2'@'localhost'	NULL	USAGE	NO
show grants;
Grants for user2@localhost
GRANT USAGE ON *.* TO 'user2'@'localhost'
GRANT SELECT ON `mysqltest`.`t2` TO 'user2'@'localhost'
select * from information_schema.column_privileges order by grantee;
GRANTEE	TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	COLUMN_NAME	PRIVILEGE_TYPE	IS_GRANTABLE
select * from information_schema.table_privileges order by grantee;
GRANTEE	TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	PRIVILEGE_TYPE	IS_GRANTABLE
select * from information_schema.schema_privileges order by grantee;
GRANTEE	TABLE_CATALOG	TABLE_SCHEMA	PRIVILEGE_TYPE	IS_GRANTABLE
'user3'@'localhost'	NULL	mysqltest	SELECT	NO
select * from information_schema.user_privileges order by grantee;
GRANTEE	TABLE_CATALOG	PRIVILEGE_TYPE	IS_GRANTABLE
'user3'@'localhost'	NULL	USAGE	NO
show grants;
Grants for user3@localhost
GRANT USAGE ON *.* TO 'user3'@'localhost'
GRANT SELECT ON `mysqltest`.* TO 'user3'@'localhost'
select * from information_schema.column_privileges where grantee like '%user%'
order by grantee;
GRANTEE	TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	COLUMN_NAME	PRIVILEGE_TYPE	IS_GRANTABLE
'user1'@'localhost'	NULL	mysqltest	t1	f1	SELECT	NO
select * from information_schema.table_privileges where grantee like '%user%'
order by grantee;
GRANTEE	TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	PRIVILEGE_TYPE	IS_GRANTABLE
'user2'@'localhost'	NULL	mysqltest	t2	SELECT	NO
select * from information_schema.schema_privileges where grantee like '%user%'
order by grantee;
GRANTEE	TABLE_CATALOG	TABLE_SCHEMA	PRIVILEGE_TYPE	IS_GRANTABLE
'user3'@'localhost'	NULL	mysqltest	SELECT	NO
select * from information_schema.user_privileges where grantee like '%user%'
order by grantee;
GRANTEE	TABLE_CATALOG	PRIVILEGE_TYPE	IS_GRANTABLE
'user1'@'localhost'	NULL	USAGE	NO
'user2'@'localhost'	NULL	USAGE	NO
'user3'@'localhost'	NULL	USAGE	NO
'user4'@'localhost'	NULL	SELECT	NO
show grants;
Grants for user4@localhost
GRANT SELECT ON *.* TO 'user4'@'localhost'
drop user user1@localhost, user2@localhost, user3@localhost, user4@localhost;
use test;
drop database mysqltest;
drop procedure if exists p1;
drop procedure if exists p2;
create procedure p1 () modifies sql data set @a = 5;
create procedure p2 () set @a = 5;
select sql_data_access from information_schema.routines
where specific_name like 'p%';
sql_data_access
MODIFIES SQL DATA
CONTAINS SQL
drop procedure p1;
drop procedure p2;
show create database information_schema;
Database	Create Database
information_schema	CREATE DATABASE `information_schema` /*!40100 DEFAULT CHARACTER SET utf8 */
create table t1(f1 LONGBLOB, f2 LONGTEXT);
select column_name,data_type,CHARACTER_OCTET_LENGTH,
CHARACTER_MAXIMUM_LENGTH
from information_schema.columns
where table_name='t1';
column_name	data_type	CHARACTER_OCTET_LENGTH	CHARACTER_MAXIMUM_LENGTH
f1	longblob	4294967295	4294967295
f2	longtext	4294967295	4294967295
drop table t1;
create table t1(f1 tinyint, f2 SMALLINT, f3 mediumint, f4 int,
f5 BIGINT, f6 BIT, f7 bit(64));
select column_name, NUMERIC_PRECISION, NUMERIC_SCALE
from information_schema.columns
where table_name='t1';
column_name	NUMERIC_PRECISION	NUMERIC_SCALE
f1	3	0
f2	5	0
f3	7	0
f4	10	0
f5	19	0
f6	1	NULL
f7	64	NULL
drop table t1;
create table t1 (f1 integer);
create trigger tr1 after insert on t1 for each row set @test_var=42;
use information_schema;
select trigger_schema, trigger_name from triggers where
trigger_name='tr1';
trigger_schema	trigger_name
test	tr1
use test;
drop table t1;
create table t1 (a int not null, b int);
use information_schema;
select column_name, column_default from columns
where table_schema='test' and table_name='t1';
column_name	column_default
a	NULL
b	NULL
use test;
show columns from t1;
Field	Type	Null	Key	Default	Extra
a	int(11)	NO			
b	int(11)	YES		NULL	
drop table t1;
CREATE TABLE t1 (a int);
CREATE TABLE t2 (b int);
SHOW TABLE STATUS FROM test
WHERE name IN ( SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_SCHEMA='test' AND TABLE_TYPE='BASE TABLE');
Name	Engine	Version	Row_format	Rows	Avg_row_length	Data_length	Max_data_length	Index_length	Data_free	Auto_increment	Create_time	Update_time	Check_time	Collation	Checksum	Create_options	Comment
t1	MyISAM	10	Fixed	0	0	0	#	1024	0	NULL	#	#	NULL	latin1_swedish_ci	NULL		
t2	MyISAM	10	Fixed	0	0	0	#	1024	0	NULL	#	#	NULL	latin1_swedish_ci	NULL		
DROP TABLE t1,t2;
create table t1(f1 int);
create view v1 (c) as select f1 from t1;
select database();
database()
NULL
show fields from test.v1;
Field	Type	Null	Key	Default	Extra
c	int(11)	YES		NULL	
drop view v1;
drop table t1;
alter database information_schema;
ERROR 42000: Access denied for user 'root'@'localhost' to database 'information_schema'
drop database information_schema;
ERROR 42000: Access denied for user 'root'@'localhost' to database 'information_schema'
drop table information_schema.tables;
ERROR 42000: Access denied for user 'root'@'localhost' to database 'information_schema'
alter table information_schema.tables;
ERROR 42000: Access denied for user 'root'@'localhost' to database 'information_schema'
use information_schema;
create temporary table schemata(f1 char(10));
ERROR 42000: Access denied for user 'root'@'localhost' to database 'information_schema'
CREATE PROCEDURE p1 ()
BEGIN
SELECT 'foo' FROM DUAL;
END |
ERROR 42000: Unknown database 'information_schema'
select  ROUTINE_NAME from routines;
ROUTINE_NAME
grant all on information_schema.* to 'user1'@'localhost';
ERROR 42000: Access denied for user 'root'@'localhost' to database 'information_schema'
grant select on information_schema.* to 'user1'@'localhost';
ERROR 42000: Access denied for user 'root'@'localhost' to database 'information_schema'
use test;
create table t1(id int);
insert into t1(id) values (1);
select 1 from (select 1 from test.t1) a;
1
1
use information_schema;
select 1 from (select 1 from test.t1) a;
1
1
use test;
drop table t1;
create table t1 (f1 int(11));
create view v1 as select * from t1;
drop table t1;
select table_type from information_schema.tables
where table_name="v1";
table_type
VIEW
drop view v1;
create temporary table t1(f1 int, index(f1));
show columns from t1;
Field	Type	Null	Key	Default	Extra
f1	int(11)	YES	MUL	NULL	
describe t1;
Field	Type	Null	Key	Default	Extra
f1	int(11)	YES	MUL	NULL	
show indexes from t1;
Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment
t1	1	f1	1	f1	A	NULL	NULL	NULL	YES	BTREE	
drop table t1;
create table t1(f1 binary(32), f2 varbinary(64));
select character_maximum_length, character_octet_length
from information_schema.columns where table_name='t1';
character_maximum_length	character_octet_length
32	32
64	64
drop table t1;
CREATE TABLE t1 (f1 BIGINT, f2 VARCHAR(20), f3 BIGINT);
INSERT INTO t1 SET f1 = 1, f2 = 'Schoenenbourg', f3 = 1;
CREATE FUNCTION func2() RETURNS BIGINT RETURN 1;
CREATE FUNCTION func1() RETURNS BIGINT
BEGIN
RETURN ( SELECT COUNT(*) FROM INFORMATION_SCHEMA.VIEWS);
END//
CREATE VIEW v1 AS SELECT 1 FROM t1
WHERE f3 = (SELECT func2 ());
SELECT func1();
func1()
1
DROP TABLE t1;
DROP VIEW v1;
DROP FUNCTION func1;
DROP FUNCTION func2;
select column_type, group_concat(table_schema, '.', table_name), count(*) as num
from information_schema.columns where
table_schema='information_schema' and
(column_type = 'varchar(7)' or column_type = 'varchar(20)')
group by column_type order by num;
column_type	group_concat(table_schema, '.', table_name)	num
varchar(7)	information_schema.ROUTINES,information_schema.VIEWS	2
varchar(20)	information_schema.COLUMNS,information_schema.FILES,information_schema.FILES,information_schema.PLUGINS,information_schema.PLUGINS,information_schema.PLUGINS	6
create table t1(f1 char(1) not null, f2 char(9) not null)
default character set utf8;
select CHARACTER_MAXIMUM_LENGTH, CHARACTER_OCTET_LENGTH from
information_schema.columns where table_schema='test' and table_name = 't1';
CHARACTER_MAXIMUM_LENGTH	CHARACTER_OCTET_LENGTH
1	3
9	27
drop table t1;
use mysql;
INSERT INTO `proc` VALUES ('test','','PROCEDURE','','SQL','CONTAINS_SQL',
'NO','DEFINER','','','BEGIN\r\n  \r\nEND','root@%','2006-03-02 18:40:03',
'2006-03-02 18:40:03','','');
select routine_name from information_schema.routines;
routine_name

delete from proc where name='';
use test;
grant select on test.* to mysqltest_1@localhost;
create table t1 (id int);
create view v1 as select * from t1;
create definer = mysqltest_1@localhost
sql security definer view v2 as select 1;
select * from information_schema.views
where table_name='v1' or table_name='v2';
TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	VIEW_DEFINITION	CHECK_OPTION	IS_UPDATABLE	DEFINER	SECURITY_TYPE
NULL	test	v1		NONE	YES	root@localhost	DEFINER
NULL	test	v2	/* ALGORITHM=UNDEFINED */ select 1 AS `1`	NONE	NO	mysqltest_1@localhost	DEFINER
drop view v1, v2;
drop table t1;
drop user mysqltest_1@localhost;
set @a:= '.';
create table t1(f1 char(5));
create table t2(f1 char(5));
select concat(@a, table_name), @a, table_name
from information_schema.tables where table_schema = 'test';
concat(@a, table_name)	@a	table_name
.t1	.	t1
.t2	.	t2
drop table t1,t2;
DROP PROCEDURE IF EXISTS p1;
DROP FUNCTION IF EXISTS f1;
CREATE PROCEDURE p1() SET @a= 1;
CREATE FUNCTION f1() RETURNS INT RETURN @a + 1;
CREATE USER mysql_bug20230@localhost;
GRANT EXECUTE ON PROCEDURE p1 TO mysql_bug20230@localhost;
GRANT EXECUTE ON FUNCTION f1 TO mysql_bug20230@localhost;
SELECT ROUTINE_NAME, ROUTINE_DEFINITION FROM INFORMATION_SCHEMA.ROUTINES;
ROUTINE_NAME	ROUTINE_DEFINITION
f1	RETURN @a + 1
p1	SET @a= 1
SHOW CREATE PROCEDURE p1;
Procedure	sql_mode	Create Procedure
p1		CREATE DEFINER=`root`@`localhost` PROCEDURE `p1`()
SET @a= 1
SHOW CREATE FUNCTION f1;
Function	sql_mode	Create Function
f1		CREATE DEFINER=`root`@`localhost` FUNCTION `f1`() RETURNS int(11)
RETURN @a + 1
SELECT ROUTINE_NAME, ROUTINE_DEFINITION FROM INFORMATION_SCHEMA.ROUTINES;
ROUTINE_NAME	ROUTINE_DEFINITION
f1	NULL
p1	NULL
SHOW CREATE PROCEDURE p1;
Procedure	sql_mode	Create Procedure
p1		NULL
SHOW CREATE FUNCTION f1;
Function	sql_mode	Create Function
f1		NULL
CALL p1();
SELECT f1();
f1()
2
DROP FUNCTION f1;
DROP PROCEDURE p1;
DROP USER mysql_bug20230@localhost;
SELECT t.table_name, c1.column_name
FROM information_schema.tables t
INNER JOIN
information_schema.columns c1
ON t.table_schema = c1.table_schema AND
t.table_name = c1.table_name
WHERE t.table_schema = 'information_schema' AND
c1.ordinal_position =
( SELECT COALESCE(MIN(c2.ordinal_position),1)
FROM information_schema.columns c2
WHERE c2.table_schema = t.table_schema AND
c2.table_name = t.table_name AND
c2.column_name LIKE '%SCHEMA%'
        );
table_name	column_name
CHARACTER_SETS	CHARACTER_SET_NAME
COLLATIONS	COLLATION_NAME
COLLATION_CHARACTER_SET_APPLICABILITY	COLLATION_NAME
COLUMNS	TABLE_SCHEMA
COLUMN_PRIVILEGES	TABLE_SCHEMA
ENGINES	ENGINE
EVENTS	EVENT_SCHEMA
FILES	TABLE_SCHEMA
GLOBAL_STATUS	VARIABLE_NAME
GLOBAL_VARIABLES	VARIABLE_NAME
KEY_COLUMN_USAGE	CONSTRAINT_SCHEMA
PARTITIONS	TABLE_SCHEMA
PLUGINS	PLUGIN_NAME
PROCESSLIST	ID
REFERENTIAL_CONSTRAINTS	CONSTRAINT_SCHEMA
ROUTINES	ROUTINE_SCHEMA
SCHEMATA	SCHEMA_NAME
SCHEMA_PRIVILEGES	TABLE_SCHEMA
SESSION_STATUS	VARIABLE_NAME
SESSION_VARIABLES	VARIABLE_NAME
STATISTICS	TABLE_SCHEMA
TABLES	TABLE_SCHEMA
TABLE_CONSTRAINTS	CONSTRAINT_SCHEMA
TABLE_PRIVILEGES	TABLE_SCHEMA
TRIGGERS	TRIGGER_SCHEMA
USER_PRIVILEGES	GRANTEE
VIEWS	TABLE_SCHEMA
SELECT t.table_name, c1.column_name
FROM information_schema.tables t
INNER JOIN
information_schema.columns c1
ON t.table_schema = c1.table_schema AND
t.table_name = c1.table_name
WHERE t.table_schema = 'information_schema' AND
c1.ordinal_position =
( SELECT COALESCE(MIN(c2.ordinal_position),1)
FROM information_schema.columns c2
WHERE c2.table_schema = 'information_schema' AND
c2.table_name = t.table_name AND
c2.column_name LIKE '%SCHEMA%'
        );
table_name	column_name
CHARACTER_SETS	CHARACTER_SET_NAME
COLLATIONS	COLLATION_NAME
COLLATION_CHARACTER_SET_APPLICABILITY	COLLATION_NAME
COLUMNS	TABLE_SCHEMA
COLUMN_PRIVILEGES	TABLE_SCHEMA
ENGINES	ENGINE
EVENTS	EVENT_SCHEMA
FILES	TABLE_SCHEMA
GLOBAL_STATUS	VARIABLE_NAME
GLOBAL_VARIABLES	VARIABLE_NAME
KEY_COLUMN_USAGE	CONSTRAINT_SCHEMA
PARTITIONS	TABLE_SCHEMA
PLUGINS	PLUGIN_NAME
PROCESSLIST	ID
REFERENTIAL_CONSTRAINTS	CONSTRAINT_SCHEMA
ROUTINES	ROUTINE_SCHEMA
SCHEMATA	SCHEMA_NAME
SCHEMA_PRIVILEGES	TABLE_SCHEMA
SESSION_STATUS	VARIABLE_NAME
SESSION_VARIABLES	VARIABLE_NAME
STATISTICS	TABLE_SCHEMA
TABLES	TABLE_SCHEMA
TABLE_CONSTRAINTS	CONSTRAINT_SCHEMA
TABLE_PRIVILEGES	TABLE_SCHEMA
TRIGGERS	TRIGGER_SCHEMA
USER_PRIVILEGES	GRANTEE
VIEWS	TABLE_SCHEMA
SELECT MAX(table_name) FROM information_schema.tables;
MAX(table_name)
VIEWS
SELECT table_name from information_schema.tables
WHERE table_name=(SELECT MAX(table_name)
FROM information_schema.tables);
table_name
VIEWS
DROP TABLE IF EXISTS bug23037;
DROP FUNCTION IF EXISTS get_value;
SELECT COLUMN_NAME, MD5(COLUMN_DEFAULT), LENGTH(COLUMN_DEFAULT) FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME='bug23037';
COLUMN_NAME	MD5(COLUMN_DEFAULT)	LENGTH(COLUMN_DEFAULT)
fld1	7cf7a6782be951a1f2464a350da926a5	65532
SELECT MD5(get_value());
MD5(get_value())
7cf7a6782be951a1f2464a350da926a5
SELECT COLUMN_NAME, MD5(COLUMN_DEFAULT), LENGTH(COLUMN_DEFAULT), COLUMN_DEFAULT=get_value() FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME='bug23037';
COLUMN_NAME	MD5(COLUMN_DEFAULT)	LENGTH(COLUMN_DEFAULT)	COLUMN_DEFAULT=get_value()
fld1	7cf7a6782be951a1f2464a350da926a5	65532	1
DROP TABLE bug23037;
DROP FUNCTION get_value;
create view v1 as
select table_schema as object_schema,
table_name   as object_name,
table_type   as object_type
from information_schema.tables
order by object_schema;
explain select * from v1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	<derived2>	system	NULL	NULL	NULL	NULL	0	const row not found
2	DERIVED	tables	ALL	NULL	NULL	NULL	NULL	0	Using filesort
explain select * from (select table_name from information_schema.tables) as a;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	PRIMARY	<derived2>	system	NULL	NULL	NULL	NULL	0	const row not found
2	DERIVED	tables	ALL	NULL	NULL	NULL	NULL	2	
drop view v1;
End of 5.0 tests.
select * from information_schema.engines WHERE ENGINE="MyISAM";
ENGINE	SUPPORT	COMMENT	TRANSACTIONS	XA	SAVEPOINTS
MyISAM	ENABLED	Default engine as of MySQL 3.23 with great performance	NO	NO	NO
grant select on *.* to user3148@localhost;
select user,db from information_schema.processlist;
user	db
user3148	test
drop user user3148@localhost;
End of 5.1 tests.
