drop table if exists t1,t2;
create table t1 (a int auto_increment , primary key (a));
insert into t1 values (NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL),(NULL);
update t1 set a=a+10 where a > 34;
update t1 set a=a+100 where a > 0;
update t1 set a=a+100 where a=1 and a=2;
update t1 set a=b+100 where a=1 and a=2;
ERROR 42S22: Unknown column 'b' in 'field list'
update t1 set a=b+100 where c=1 and a=2;
ERROR 42S22: Unknown column 'c' in 'where clause'
update t1 set d=a+100 where a=1;
ERROR 42S22: Unknown column 'd' in 'field list'
select * from t1;
a
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
145
146
drop table t1;
CREATE TABLE t1
(
place_id int (10) unsigned NOT NULL,
shows int(10) unsigned DEFAULT '0' NOT NULL,
ishows int(10) unsigned DEFAULT '0' NOT NULL,
ushows int(10) unsigned DEFAULT '0' NOT NULL,
clicks int(10) unsigned DEFAULT '0' NOT NULL,
iclicks int(10) unsigned DEFAULT '0' NOT NULL,
uclicks int(10) unsigned DEFAULT '0' NOT NULL,
ts timestamp(14),
PRIMARY KEY (place_id,ts)
);
INSERT INTO t1 (place_id,shows,ishows,ushows,clicks,iclicks,uclicks,ts)
VALUES (1,0,0,0,0,0,0,20000928174434);
UPDATE t1 SET shows=shows+1,ishows=ishows+1,ushows=ushows+1,clicks=clicks+1,iclicks=iclicks+1,uclicks=uclicks+1 WHERE place_id=1 AND ts>="2000-09-28 00:00:00";
select place_id,shows from t1;
place_id	shows
1	1
drop table t1;
CREATE TABLE t1 (
lfdnr int(10) unsigned NOT NULL default '0',
ticket int(10) unsigned NOT NULL default '0',
client varchar(255) NOT NULL default '',
replyto varchar(255) NOT NULL default '',
subject varchar(100) NOT NULL default '',
timestamp int(10) unsigned NOT NULL default '0',
tstamp timestamp(14) NOT NULL,
status int(3) NOT NULL default '0',
type varchar(15) NOT NULL default '',
assignment int(10) unsigned NOT NULL default '0',
fupcount int(4) unsigned NOT NULL default '0',
parent int(10) unsigned NOT NULL default '0',
activity int(10) unsigned NOT NULL default '0',
priority tinyint(1) unsigned NOT NULL default '1',
cc varchar(255) NOT NULL default '',
bcc varchar(255) NOT NULL default '',
body text NOT NULL,
comment text,
header text,
PRIMARY KEY  (lfdnr),
KEY k1 (timestamp),
KEY k2 (type),
KEY k3 (parent),
KEY k4 (assignment),
KEY ticket (ticket)
) ENGINE=MyISAM;
INSERT INTO t1 VALUES (773,773,'','','',980257344,20010318180652,0,'Open',10,0,0,0,1,'','','','','');
alter table t1 change lfdnr lfdnr int(10) unsigned not null auto_increment;
update t1 set status=1 where type='Open';
select status from t1;
status
1
drop table t1;
create table t1 (a int not null, b int not null, key (a));
insert into t1 values (1,1),(1,2),(1,3),(3,1),(3,2),(3,3),(3,1),(3,2),(3,3),(2,1),(2,2),(2,3);
SET @tmp=0;
update t1 set b=(@tmp:=@tmp+1) order by a;
update t1 set b=99 where a=1 order by b asc limit 1;
select * from t1 order by a,b;
a	b
1	2
1	3
1	99
2	4
2	5
2	6
3	7
3	8
3	9
3	10
3	11
3	12
update t1 set b=100 where a=1 order by b desc limit 2;
update t1 set a=a+10+b where a=1 order by b;
select * from t1 order by a,b;
a	b
2	4
2	5
2	6
3	7
3	8
3	9
3	10
3	11
3	12
13	2
111	100
111	100
create table t2 (a int not null, b int not null);
insert into t2 values (1,1),(1,2),(1,3);
update t1 set b=(select distinct 1 from (select * from t2) a);
drop table t1,t2;
CREATE TABLE t1 (
`id_param` smallint(3) unsigned NOT NULL default '0',
`nom_option` char(40) NOT NULL default '',
`valid` tinyint(1) NOT NULL default '0',
KEY `id_param` (`id_param`,`nom_option`)
) ENGINE=MyISAM;
INSERT INTO t1 (id_param,nom_option,valid) VALUES (185,'600x1200',1);
UPDATE t1 SET nom_option='test' WHERE id_param=185 AND nom_option='600x1200' AND valid=1 LIMIT 1;
select * from t1;
id_param	nom_option	valid
185	test	1
drop table t1;
create table t1 (F1 VARCHAR(30), F2 VARCHAR(30), F3 VARCHAR(30), cnt int, groupid int, KEY groupid_index (groupid));
insert into t1 (F1,F2,F3,cnt,groupid) values ('0','0','0',1,6),
('0','1','2',1,5), ('0','2','0',1,3), ('1','0','1',1,2),
('1','2','1',1,1), ('1','2','2',1,1), ('2','0','1',2,4),
('2','2','0',1,7);
delete from m1 using t1 m1,t1 m2 where m1.groupid=m2.groupid and (m1.cnt < m2.cnt or m1.cnt=m2.cnt and m1.F3>m2.F3);
select * from t1;
F1	F2	F3	cnt	groupid
0	0	0	1	6
0	1	2	1	5
0	2	0	1	3
1	0	1	1	2
1	2	1	1	1
2	0	1	2	4
2	2	0	1	7
drop table t1;
CREATE TABLE t1 ( 
`colA` int(10) unsigned NOT NULL auto_increment,
`colB` int(11) NOT NULL default '0',
PRIMARY KEY  (`colA`)
);
INSERT INTO t1 VALUES (4433,5424);
CREATE TABLE t2 (
`colC` int(10) unsigned NOT NULL default '0',
`colA` int(10) unsigned NOT NULL default '0',
`colD` int(10) unsigned NOT NULL default '0',
`colE` int(10) unsigned NOT NULL default '0',
`colF` int(10) unsigned NOT NULL default '0',
PRIMARY KEY  (`colC`,`colA`,`colD`,`colE`)
);
INSERT INTO t2 VALUES (3,4433,10005,495,500);
INSERT INTO t2 VALUES (3,4433,10005,496,500);
INSERT INTO t2 VALUES (3,4433,10009,494,500);
INSERT INTO t2 VALUES (3,4433,10011,494,500);
INSERT INTO t2 VALUES (3,4433,10005,497,500);
INSERT INTO t2 VALUES (3,4433,10013,489,500);
INSERT INTO t2 VALUES (3,4433,10005,494,500);
INSERT INTO t2 VALUES (3,4433,10005,493,500);
INSERT INTO t2 VALUES (3,4433,10005,492,500);
UPDATE IGNORE t2,t1 set t2.colE = t2.colE + 1,colF=0 WHERE t1.colA = t2.colA AND (t1.colB & 4096) > 0 AND (colE + 1) < colF;
SELECT * FROM t2;
colC	colA	colD	colE	colF
3	4433	10005	495	500
3	4433	10005	496	500
3	4433	10009	495	0
3	4433	10011	495	0
3	4433	10005	498	0
3	4433	10013	490	0
3	4433	10005	494	500
3	4433	10005	493	500
3	4433	10005	492	500
DROP TABLE t1;
DROP TABLE t2;
create table t1 (c1 int, c2 char(6), c3 int);
create table t2 (c1 int, c2 char(6));
insert into t1 values (1, "t1c2-1", 10), (2, "t1c2-2", 20);
update t1 left join t2 on t1.c1 = t2.c1 set t2.c2 = "t2c2-1";
update t1 left join t2 on t1.c1 = t2.c1 set t2.c2 = "t2c2-1" where t1.c3 = 10;
drop table t1, t2;
create table t1 (id int not null auto_increment primary key, id_str varchar(32));
insert into t1 (id_str) values ("test");
update t1 set id_str = concat(id_str, id) where id = last_insert_id();
select * from t1;
id	id_str
1	test1
drop table t1;
create table t1 (a int, b char(255), key(a, b(20)));
insert into t1 values (0, '1');
update t1 set b = b + 1 where a = 0;
select * from t1;
a	b
0	2
drop table t1;
create table t1 (a int, b varchar(10), key b(b(5))) engine=myisam;
create table t2 (a int, b varchar(10)) engine=myisam;
insert into t1 values ( 1, 'abcd1e');
insert into t1 values ( 2, 'abcd2e');
insert into t2 values ( 1, 'abcd1e');
insert into t2 values ( 2, 'abcd2e');
analyze table t1,t2;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	OK
test.t2	analyze	status	OK
update t1, t2 set t1.a = t2.a where t2.b = t1.b;
show warnings;
Level	Code	Message
drop table t1, t2;
create table t1(f1 int, f2 int);
create table t2(f3 int, f4 int);
create index idx on t2(f3);
insert into t1 values(1,0),(2,0);
insert into t2 values(1,1),(2,2);
UPDATE t1 SET t1.f2=(SELECT MAX(t2.f4) FROM t2 WHERE t2.f3=t1.f1);
select * from t1;
f1	f2
1	1
2	2
drop table t1,t2;
create table t1(f1 int);
select DATABASE();
DATABASE()
test
update t1 set f1=1 where count(*)=1;
ERROR HY000: Invalid use of group function
select DATABASE();
DATABASE()
test
delete from t1 where count(*)=1;
ERROR HY000: Invalid use of group function
drop table t1;
create table t1 ( a int, b int default 0, index (a) );
insert into t1 (a) values (0),(0),(0),(0),(0),(0),(0),(0);
flush status;
select a from t1 order by a limit 1;
a
0
show status like 'handler_read%';
Variable_name	Value
Handler_read_first	1
Handler_read_key	0
Handler_read_next	0
Handler_read_prev	0
Handler_read_rnd	0
Handler_read_rnd_next	0
flush status;
update t1 set a=9999 order by a limit 1;
update t1 set b=9999 order by a limit 1;
show status like 'handler_read%';
Variable_name	Value
Handler_read_first	1
Handler_read_key	0
Handler_read_next	0
Handler_read_prev	0
Handler_read_rnd	2
Handler_read_rnd_next	9
flush status;
delete from t1 order by a limit 1;
show status like 'handler_read%';
Variable_name	Value
Handler_read_first	1
Handler_read_key	0
Handler_read_next	0
Handler_read_prev	0
Handler_read_rnd	0
Handler_read_rnd_next	0
flush status;
delete from t1 order by a desc limit 1;
show status like 'handler_read%';
Variable_name	Value
Handler_read_first	0
Handler_read_key	0
Handler_read_next	0
Handler_read_prev	0
Handler_read_rnd	1
Handler_read_rnd_next	9
alter table t1 disable keys;
flush status;
delete from t1 order by a limit 1;
show status like 'handler_read%';
Variable_name	Value
Handler_read_first	0
Handler_read_key	0
Handler_read_next	0
Handler_read_prev	0
Handler_read_rnd	1
Handler_read_rnd_next	9
select * from t1;
a	b
0	0
0	0
0	0
0	0
0	0
update t1 set a=a+10,b=1 order by a limit 3;
update t1 set a=a+11,b=2 order by a limit 3;
update t1 set a=a+12,b=3 order by a limit 3;
select * from t1 order by a;
a	b
11	2
21	2
22	3
22	3
23	3
drop table t1;
create table t1 (f1 date not null);
insert into t1 values('2000-01-01'),('0000-00-00');
update t1 set f1='2002-02-02' where f1 is null;
select * from t1;
f1
2000-01-01
2002-02-02
drop table t1;
create table t1 (f1 int);
create table t2 (f2 int);
insert into t1 values(1),(2);
insert into t2 values(1),(1);
update t1,t2 set f1=3,f2=3 where f1=f2 and f1=1;
affected rows: 3
info: Rows matched: 3  Changed: 3  Warnings: 0
update t2 set f2=1;
update t1 set f1=1 where f1=3;
update t2,t1 set f1=3,f2=3 where f1=f2 and f1=1;
affected rows: 3
info: Rows matched: 3  Changed: 3  Warnings: 0
drop table t1,t2;
create table t1 (a int);
insert into t1 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
create table t2 (a int, filler1 char(200), filler2 char(200), key(a));
insert into t2 select A.a + 10*B.a, 'filler','filler' from t1 A, t1 B;
flush status;
update t2 set a=3 where a=2;
show status like 'handler_read%';
Variable_name	Value
Handler_read_first	0
Handler_read_key	1
Handler_read_next	1
Handler_read_prev	0
Handler_read_rnd	1
Handler_read_rnd_next	0
drop table t1, t2;
create table t1(f1 int, `*f2` int);
insert into t1 values (1,1);
update t1 set `*f2`=1;
drop table t1;
