drop table if exists t1,t2,t3; drop database if exists mysqltest; create table t1 (b char(0)); insert into t1 values (""),(null); select * from t1; b NULL drop table if exists t1; create table t1 (b char(0) not null); create table if not exists t1 (b char(0) not null); insert into t1 values (""),(null); Warnings: Warning 1263 Column set to default value; NULL supplied to NOT NULL column 'b' at row 2 select * from t1; b drop table t1; create table t1 (a int not null auto_increment,primary key (a)) engine=heap; drop table t1; create table t2 engine=heap select * from t1; ERROR 42S02: Table 'test.t1' doesn't exist create table t2 select auto+1 from t1; ERROR 42S02: Table 'test.t1' doesn't exist drop table if exists t1,t2; Warnings: Note 1051 Unknown table 't1' Note 1051 Unknown table 't2' create table t1 (b char(0) not null, index(b)); ERROR 42000: The used storage engine can't index column 'b' create table t1 (a int not null,b text) engine=heap; ERROR 42000: The used table type doesn't support BLOB/TEXT columns drop table if exists t1; Warnings: Note 1051 Unknown table 't1' create table t1 (ordid int(8) not null auto_increment, ord varchar(50) not null, primary key (ord,ordid)) engine=heap; ERROR 42000: Incorrect table definition; there can be only one auto column and it must be defined as a key create table not_existing_database.test (a int); Got one of the listed errors create table `a/a` (a int); ERROR 42000: Incorrect table name 'a/a' create table `aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa` (aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa int); ERROR 42000: Incorrect table name 'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa' create table a (`aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa` int); ERROR 42000: Identifier name 'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa' is too long create table test (a datetime default now()); ERROR 42000: Invalid default value for 'a' create table test (a datetime on update now()); ERROR HY000: Invalid ON UPDATE clause for 'a' column create table test (a int default 100 auto_increment); ERROR 42000: Invalid default value for 'a' create table 1ea10 (1a20 int,1e int); insert into 1ea10 values(1,1); select 1ea10.1a20,1e+ 1e+10 from 1ea10; 1a20 1e+ 1e+10 1 10000000001 drop table 1ea10; create table t1 (t1.index int); drop table t1; drop database if exists mysqltest; Warnings: Note 1008 Can't drop database 'mysqltest'; database doesn't exist create database mysqltest; create table mysqltest.$test1 (a$1 int, $b int, c$ int); insert into mysqltest.$test1 values (1,2,3); select a$1, $b, c$ from mysqltest.$test1; a$1 $b c$ 1 2 3 create table mysqltest.test2$ (a int); drop table mysqltest.test2$; drop database mysqltest; create table `` (a int); ERROR 42000: Incorrect table name '' drop table if exists ``; ERROR 42000: Incorrect table name '' create table t1 (`` int); ERROR 42000: Incorrect column name '' create table t1 (i int, index `` (i)); ERROR 42000: Incorrect index name '' create table t1 (a int auto_increment not null primary key, B CHAR(20)); insert into t1 (b) values ("hello"),("my"),("world"); create table t2 (key (b)) select * from t1; explain select * from t2 where b="world"; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 ref B B 21 const 1 Using where select * from t2 where b="world"; a B 3 world drop table t1,t2; create table t1(x varchar(50) ); create table t2 select x from t1 where 1=2; describe t1; Field Type Null Key Default Extra x varchar(50) YES NULL describe t2; Field Type Null Key Default Extra x varchar(50) YES NULL drop table t2; create table t2 select now() as a , curtime() as b, curdate() as c , 1+1 as d , 1.0 + 1 as e , 33333333333333333 + 3 as f; describe t2; Field Type Null Key Default Extra a datetime NO 0000-00-00 00:00:00 b time NO 00:00:00 c date NO 0000-00-00 d int(2) NO 0 e decimal(6,1) NO 0.0 f bigint(18) NO 0 drop table t2; create table t2 select CAST("2001-12-29" AS DATE) as d, CAST("20:45:11" AS TIME) as t, CAST("2001-12-29 20:45:11" AS DATETIME) as dt; describe t2; Field Type Null Key Default Extra d date YES NULL t time YES NULL dt datetime YES NULL drop table t1,t2; create table t1 (a tinyint); create table t2 (a int) select * from t1; describe t1; Field Type Null Key Default Extra a tinyint(4) YES NULL describe t2; Field Type Null Key Default Extra a int(11) YES NULL drop table if exists t2; create table t2 (a int, a float) select * from t1; ERROR 42S21: Duplicate column name 'a' drop table if exists t2; Warnings: Note 1051 Unknown table 't2' create table t2 (a int) select a as b, a+1 as b from t1; ERROR 42S21: Duplicate column name 'b' drop table if exists t2; Warnings: Note 1051 Unknown table 't2' create table t2 (b int) select a as b, a+1 as b from t1; ERROR 42S21: Duplicate column name 'b' drop table if exists t1,t2; Warnings: Note 1051 Unknown table 't2' CREATE TABLE t1 (a int not null); INSERT INTO t1 values (1),(2),(1); CREATE TABLE t2 (primary key(a)) SELECT * FROM t1; ERROR 23000: Duplicate entry '1' for key 1 SELECT * from t2; ERROR 42S02: Table 'test.t2' doesn't exist DROP TABLE t1; DROP TABLE IF EXISTS t2; Warnings: Note 1051 Unknown table 't2' create table t1 (a int not null, b int, primary key(a), key (b), key (b), key (b), key (b), key (b), key (b), key (b), key (b), key (b), key (b), key (b), key (b), key (b), key (b), key (b), key (b), key (b), key (b), key (b), key (b), key (b), key (b), key (b), key (b), key (b), key (b), key (b), key (b), key (b), key (b), key (b)); show create table t1; Table Create Table t1 CREATE TABLE `t1` ( `a` int(11) NOT NULL, `b` int(11) default NULL, PRIMARY KEY (`a`), KEY `b` (`b`), KEY `b_2` (`b`), KEY `b_3` (`b`), KEY `b_4` (`b`), KEY `b_5` (`b`), KEY `b_6` (`b`), KEY `b_7` (`b`), KEY `b_8` (`b`), KEY `b_9` (`b`), KEY `b_10` (`b`), KEY `b_11` (`b`), KEY `b_12` (`b`), KEY `b_13` (`b`), KEY `b_14` (`b`), KEY `b_15` (`b`), KEY `b_16` (`b`), KEY `b_17` (`b`), KEY `b_18` (`b`), KEY `b_19` (`b`), KEY `b_20` (`b`), KEY `b_21` (`b`), KEY `b_22` (`b`), KEY `b_23` (`b`), KEY `b_24` (`b`), KEY `b_25` (`b`), KEY `b_26` (`b`), KEY `b_27` (`b`), KEY `b_28` (`b`), KEY `b_29` (`b`), KEY `b_30` (`b`), KEY `b_31` (`b`) ) ENGINE=MyISAM DEFAULT CHARSET=latin1 drop table t1; create table t1 select if(1,'1','0'), month("2002-08-02"); drop table t1; create table t1 select if('2002'='2002','Y','N'); select * from t1; if('2002'='2002','Y','N') Y drop table if exists t1; SET SESSION storage_engine="heap"; SELECT @@storage_engine; @@storage_engine HEAP CREATE TABLE t1 (a int not null); show create table t1; Table Create Table t1 CREATE TABLE `t1` ( `a` int(11) NOT NULL ) ENGINE=MEMORY DEFAULT CHARSET=latin1 drop table t1; SET SESSION storage_engine="gemini"; ERROR 42000: Unknown table engine 'gemini' SELECT @@storage_engine; @@storage_engine HEAP CREATE TABLE t1 (a int not null); show create table t1; Table Create Table t1 CREATE TABLE `t1` ( `a` int(11) NOT NULL ) ENGINE=MEMORY DEFAULT CHARSET=latin1 SET SESSION storage_engine=default; drop table t1; create table t1 ( k1 varchar(2), k2 int, primary key(k1,k2)); insert into t1 values ("a", 1), ("b", 2); insert into t1 values ("c", NULL); ERROR 23000: Column 'k2' cannot be null insert into t1 values (NULL, 3); ERROR 23000: Column 'k1' cannot be null insert into t1 values (NULL, NULL); ERROR 23000: Column 'k1' cannot be null drop table t1; create table t1 select x'4132'; drop table t1; create table t1 select 1,2,3; create table if not exists t1 select 1,2; create table if not exists t1 select 1,2,3,4; ERROR 21S01: Column count doesn't match value count at row 1 create table if not exists t1 select 1; select * from t1; 1 2 3 1 2 3 0 1 2 0 0 1 drop table t1; create table t1 select 1,2,3; create table if not exists t1 select 1,2; create table if not exists t1 select 1,2,3,4; ERROR 21S01: Column count doesn't match value count at row 1 create table if not exists t1 select 1; select * from t1; 1 2 3 1 2 3 0 1 2 0 0 1 drop table t1; create table t1 (a int not null, b int, primary key (a)); insert into t1 values (1,1); create table if not exists t1 select 2; select * from t1; a b 1 1 0 2 create table if not exists t1 select 3 as 'a',4 as 'b'; create table if not exists t1 select 3 as 'a',3 as 'b'; ERROR 23000: Duplicate entry '3' for key 1 select * from t1; a b 1 1 0 2 3 4 drop table t1; create table `t1 `(a int); ERROR 42000: Incorrect table name 't1 ' create database `db1 `; ERROR 42000: Incorrect database name 'db1 ' create table t1(`a ` int); ERROR 42000: Incorrect column name 'a ' create table t1 (a int,); ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')' at line 1 create table t1 (a int,,b int); ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'b int)' at line 1 create table t1 (,b int); ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'b int)' at line 1 create table t1 (a int, key(a)); create table t2 (b int, foreign key(b) references t1(a), key(b)); drop table if exists t1,t2; create table t1(id int not null, name char(20)); insert into t1 values(10,'mysql'),(20,'monty- the creator'); create table t2(id int not null); insert into t2 values(10),(20); create table t3 like t1; show create table t3; Table Create Table t3 CREATE TABLE `t3` ( `id` int(11) NOT NULL, `name` char(20) default NULL ) ENGINE=MyISAM DEFAULT CHARSET=latin1 select * from t3; id name create table if not exists t3 like t1; Warnings: Note 1050 Table 't3' already exists select @@warning_count; @@warning_count 1 create temporary table t3 like t2; show create table t3; Table Create Table t3 CREATE TEMPORARY TABLE `t3` ( `id` int(11) NOT NULL ) ENGINE=MyISAM DEFAULT CHARSET=latin1 select * from t3; id drop table t3; show create table t3; Table Create Table t3 CREATE TABLE `t3` ( `id` int(11) NOT NULL, `name` char(20) default NULL ) ENGINE=MyISAM DEFAULT CHARSET=latin1 select * from t3; id name drop table t2, t3; create database mysqltest; create table mysqltest.t3 like t1; create temporary table t3 like mysqltest.t3; show create table t3; Table Create Table t3 CREATE TEMPORARY TABLE `t3` ( `id` int(11) NOT NULL, `name` char(20) default NULL ) ENGINE=MyISAM DEFAULT CHARSET=latin1 create table t2 like t3; show create table t2; Table Create Table t2 CREATE TABLE `t2` ( `id` int(11) NOT NULL, `name` char(20) default NULL ) ENGINE=MyISAM DEFAULT CHARSET=latin1 select * from t2; id name create table t3 like t1; create table t3 like mysqltest.t3; ERROR 42S01: Table 't3' already exists create table non_existing_database.t1 like t1; Got one of the listed errors create table t3 like non_existing_table; ERROR 42S02: Unknown table 'non_existing_table' create temporary table t3 like t1; ERROR 42S01: Table 't3' already exists create table t3 like `a/a`; ERROR 42000: Incorrect table name 'a/a' drop table t1, t2, t3; drop table t3; drop database mysqltest; SET SESSION storage_engine="heap"; SELECT @@storage_engine; @@storage_engine HEAP CREATE TABLE t1 (a int not null); show create table t1; Table Create Table t1 CREATE TABLE `t1` ( `a` int(11) NOT NULL ) ENGINE=MEMORY DEFAULT CHARSET=latin1 drop table t1; SET SESSION storage_engine="gemini"; ERROR 42000: Unknown table engine 'gemini' SELECT @@storage_engine; @@storage_engine HEAP CREATE TABLE t1 (a int not null); show create table t1; Table Create Table t1 CREATE TABLE `t1` ( `a` int(11) NOT NULL ) ENGINE=MEMORY DEFAULT CHARSET=latin1 SET SESSION storage_engine=default; drop table t1; create table t1(a int,b int,c int unsigned,d date,e char,f datetime,g time,h blob); insert into t1(a)values(1); insert into t1(a,b,c,d,e,f,g,h) values(2,-2,2,'1825-12-14','a','2003-1-1 3:2:1','4:3:2','binary data'); select * from t1; a b c d e f g h 1 NULL NULL NULL NULL NULL NULL NULL 2 -2 2 1825-12-14 a 2003-01-01 03:02:01 04:03:02 binary data select a, ifnull(b,cast(-7 as signed)) as b, ifnull(c,cast(7 as unsigned)) as c, ifnull(d,cast('2000-01-01' as date)) as d, ifnull(e,cast('b' as char)) as e, ifnull(f,cast('2000-01-01' as datetime)) as f, ifnull(g,cast('5:4:3' as time)) as g, ifnull(h,cast('yet another binary data' as binary)) as h, addtime(cast('1:0:0' as time),cast('1:0:0' as time)) as dd from t1; a b c d e f g h dd 1 -7 7 2000-01-01 b 2000-01-01 00:00:00 05:04:03 yet another binary data 02:00:00 2 -2 2 1825-12-14 a 2003-01-01 03:02:01 04:03:02 binary data 02:00:00 create table t2 select a, ifnull(b,cast(-7 as signed)) as b, ifnull(c,cast(7 as unsigned)) as c, ifnull(d,cast('2000-01-01' as date)) as d, ifnull(e,cast('b' as char)) as e, ifnull(f,cast('2000-01-01' as datetime)) as f, ifnull(g,cast('5:4:3' as time)) as g, ifnull(h,cast('yet another binary data' as binary)) as h, addtime(cast('1:0:0' as time),cast('1:0:0' as time)) as dd from t1; explain t2; Field Type Null Key Default Extra a int(11) YES NULL b bigint(11) NO 0 c bigint(10) NO 0 d date YES NULL e varchar(1) NO f datetime YES NULL g time YES NULL h varbinary(23) NO dd time YES NULL select * from t2; a b c d e f g h dd 1 -7 7 2000-01-01 b 2000-01-01 00:00:00 05:04:03 yet another binary data 02:00:00 2 -2 2 1825-12-14 a 2003-01-01 03:02:01 04:03:02 binary data 02:00:00 drop table t1, t2; create table t1 (a tinyint, b smallint, c mediumint, d int, e bigint, f float(3,2), g double(4,3), h decimal(5,4), i year, j date, k timestamp, l datetime, m enum('a','b'), n set('a','b'), o char(10)); create table t2 select ifnull(a,a), ifnull(b,b), ifnull(c,c), ifnull(d,d), ifnull(e,e), ifnull(f,f), ifnull(g,g), ifnull(h,h), ifnull(i,i), ifnull(j,j), ifnull(k,k), ifnull(l,l), ifnull(m,m), ifnull(n,n), ifnull(o,o) from t1; show create table t2; Table Create Table t2 CREATE TABLE `t2` ( `ifnull(a,a)` tinyint(4) default NULL, `ifnull(b,b)` smallint(6) default NULL, `ifnull(c,c)` mediumint(9) default NULL, `ifnull(d,d)` int(11) default NULL, `ifnull(e,e)` bigint(20) default NULL, `ifnull(f,f)` float(3,2) default NULL, `ifnull(g,g)` double(4,3) default NULL, `ifnull(h,h)` decimal(6,4) default NULL, `ifnull(i,i)` year(4) default NULL, `ifnull(j,j)` date default NULL, `ifnull(k,k)` datetime NOT NULL default '0000-00-00 00:00:00', `ifnull(l,l)` datetime default NULL, `ifnull(m,m)` varchar(1) default NULL, `ifnull(n,n)` varchar(3) default NULL, `ifnull(o,o)` varchar(10) default NULL ) ENGINE=MyISAM DEFAULT CHARSET=latin1 drop table t1,t2; create table t1(str varchar(10) default 'def',strnull varchar(10),intg int default '10',rel double default '3.14'); insert into t1 values ('','',0,0.0); describe t1; Field Type Null Key Default Extra str varchar(10) YES def strnull varchar(10) YES NULL intg int(11) YES 10 rel double YES 3.14 create table t2 select default(str) as str, default(strnull) as strnull, default(intg) as intg, default(rel) as rel from t1; describe t2; Field Type Null Key Default Extra str varchar(10) YES NULL strnull varchar(10) YES NULL intg int(11) YES NULL rel double YES NULL drop table t1, t2; create table t1(name varchar(10), age smallint default -1); describe t1; Field Type Null Key Default Extra name varchar(10) YES NULL age smallint(6) YES -1 create table t2(name varchar(10), age smallint default - 1); describe t2; Field Type Null Key Default Extra name varchar(10) YES NULL age smallint(6) YES -1 drop table t1, t2; create table t1(cenum enum('a'), cset set('b')); create table t2(cenum enum('a','a'), cset set('b','b')); Warnings: Note 1291 Column 'cenum' has duplicated value 'a' in ENUM Note 1291 Column 'cset' has duplicated value 'b' in SET create table t3(cenum enum('a','A','a','c','c'), cset set('b','B','b','d','d')); Warnings: Note 1291 Column 'cenum' has duplicated value 'a' in ENUM Note 1291 Column 'cenum' has duplicated value 'A' in ENUM Note 1291 Column 'cenum' has duplicated value 'c' in ENUM Note 1291 Column 'cset' has duplicated value 'b' in SET Note 1291 Column 'cset' has duplicated value 'B' in SET Note 1291 Column 'cset' has duplicated value 'd' in SET drop table t1, t2, t3; create database mysqltest; use mysqltest; select database(); database() mysqltest drop database mysqltest; select database(); database() NULL select database(); database() NULL use test; create table t1 (a int, index `primary` (a)); ERROR 42000: Incorrect index name 'primary' create table t1 (a int, index `PRIMARY` (a)); ERROR 42000: Incorrect index name 'PRIMARY' create table t1 (`primary` int, index(`primary`)); show create table t1; Table Create Table t1 CREATE TABLE `t1` ( `primary` int(11) default NULL, KEY `primary_2` (`primary`) ) ENGINE=MyISAM DEFAULT CHARSET=latin1 create table t2 (`PRIMARY` int, index(`PRIMARY`)); show create table t2; Table Create Table t2 CREATE TABLE `t2` ( `PRIMARY` int(11) default NULL, KEY `PRIMARY_2` (`PRIMARY`) ) ENGINE=MyISAM DEFAULT CHARSET=latin1 create table t3 (a int); alter table t3 add index `primary` (a); ERROR 42000: Incorrect index name 'primary' alter table t3 add index `PRIMARY` (a); ERROR 42000: Incorrect index name 'PRIMARY' create table t4 (`primary` int); alter table t4 add index(`primary`); show create table t4; Table Create Table t4 CREATE TABLE `t4` ( `primary` int(11) default NULL, KEY `primary_2` (`primary`) ) ENGINE=MyISAM DEFAULT CHARSET=latin1 create table t5 (`PRIMARY` int); alter table t5 add index(`PRIMARY`); show create table t5; Table Create Table t5 CREATE TABLE `t5` ( `PRIMARY` int(11) default NULL, KEY `PRIMARY_2` (`PRIMARY`) ) ENGINE=MyISAM DEFAULT CHARSET=latin1 drop table t1, t2, t3, t4, t5; CREATE TABLE t1(id varchar(10) NOT NULL PRIMARY KEY, dsc longtext); INSERT INTO t1 VALUES ('5000000001', NULL),('5000000003', 'Test'),('5000000004', NULL); CREATE TABLE t2(id varchar(15) NOT NULL, proc varchar(100) NOT NULL, runID varchar(16) NOT NULL, start datetime NOT NULL, PRIMARY KEY (id,proc,runID,start)); INSERT INTO t2 VALUES ('5000000001', 'proc01', '20031029090650', '2003-10-29 13:38:40'),('5000000001', 'proc02', '20031029090650', '2003-10-29 13:38:51'),('5000000001', 'proc03', '20031029090650', '2003-10-29 13:38:11'),('5000000002', 'proc09', '20031024013310', '2003-10-24 01:33:11'),('5000000002', 'proc09', '20031024153537', '2003-10-24 15:36:04'),('5000000004', 'proc01', '20031024013641', '2003-10-24 01:37:29'),('5000000004', 'proc02', '20031024013641', '2003-10-24 01:37:39'); CREATE TABLE t3 SELECT t1.dsc,COUNT(DISTINCT t2.id) AS countOfRuns FROM t1 LEFT JOIN t2 ON (t1.id=t2.id) GROUP BY t1.id; SELECT * FROM t3; dsc countOfRuns NULL 1 Test 0 NULL 1 drop table t1, t2, t3;