drop table if exists t1,t2;
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);
select * from t1;
b


drop table if exists t1;
create table t2 type=heap select * from t1;
Table 'test.t1' doesn't exist
create table t2 select auto+1 from t1;
Table 'test.t1' doesn't exist
drop table if exists t1,t2;
create table t1 (b char(0) not null, index(b));
The used table handler can't index column 'b'
create table t1 (a int not null auto_increment,primary key (a)) type=heap;
The used table type doesn't support AUTO_INCREMENT columns
create table t1 (a int not null,b text) type=heap;
The used table type doesn't support BLOB/TEXT columns
create table t1 (a int ,primary key(a)) type=heap;
All parts of a PRIMARY KEY must be NOT NULL;  If you need NULL in a key, use UNIQUE instead
create table t1 (a int,b text, index(a)) type=isam;
Column 'a' is used with UNIQUE or INDEX but is not defined as NOT NULL
create table t1 (a int,b text, index(b)) type=isam;
BLOB column 'b' can't be used in key specification with the used table type
drop table if exists t1;
create table t1 (ordid int(8) not null auto_increment, ord  varchar(50) not null, primary key (ord,ordid)) type=isam;
Incorrect table definition; There can only be one auto column and it must be defined as a key
create table t1 (ordid int(8) not null auto_increment, ord  varchar(50) not null, primary key (ord,ordid)) type=heap;
The used table type doesn't support AUTO_INCREMENT columns
create table t1 (ordid int(8), primary key (ordid));
All parts of a PRIMARY KEY must be NOT NULL;  If you need NULL in a key, use UNIQUE instead
create table t1 (ordid int(8), unique (ordid)) type=isam;
Column 'ordid' is used with UNIQUE or INDEX but is not defined as NOT NULL
create table not_existing_database.test (a int);
Can't create/write to file './not_existing_database/test.frm' (Errcode: 2)
create table `a/a` (a int);
Incorrect table name 'a/a'
create table `aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa` (aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa int);
Incorrect table name 'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa'
create table a (`aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa` int);
Identifier name 'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa' is too long
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 test_$1;
create database test_$1;
create table test_$1.$test1 (a$1 int, $b int, c$ int);
insert into test_$1.$test1 values (1,2,3);
select a$1, $b, c$ from test_$1.$test1;
a$1	$b	c$
1	2	3
create table test_$1.test2$ (a int);
drop table test_$1.test2$;
drop database test_$1;
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";
table	type	possible_keys	key	key_len	ref	rows	Extra
t2	ref	B	B	21	const	1	where used
select * from t2 where b="world";
a	B
3	world
drop table t1,t2;