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create table t1(a integer) engine=innodb;
ERROR 42000: This table type requires a primary key
show warnings;
Level Code Message
Error 1173 This table type requires a primary key
create table t1(a integer unique key) engine=innodb;
ERROR 42000: This table type requires a primary key
show warnings;
Level Code Message
Error 1173 This table type requires a primary key
create table t1(a integer not null, b integer,
unique key(a,b)) engine=innodb;
ERROR 42000: This table type requires a primary key
show warnings;
Level Code Message
Error 1173 This table type requires a primary key
create table t1(a integer not null primary key) engine=innodb;
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`a` int(11) NOT NULL,
PRIMARY KEY (`a`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_uca1400_ai_ci
show warnings;
Level Code Message
drop table t1;
create table t1(a integer not null unique key) engine=innodb;
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`a` int(11) NOT NULL,
UNIQUE KEY `a` (`a`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_uca1400_ai_ci
show warnings;
Level Code Message
drop table t1;
set global innodb_force_primary_key = 0;
create table t1(a integer) engine=innodb;
show warnings;
Level Code Message
insert into t1 values (1),(2),(3);
set global innodb_force_primary_key = 1;
select * from t1;
a
1
2
3
create table t2(a integer) engine=innodb;
ERROR 42000: This table type requires a primary key
show warnings;
Level Code Message
Error 1173 This table type requires a primary key
drop table t1;
create table t1 (i int not null, key(i)) engine=innodb;
ERROR 42000: This table type requires a primary key
create table t1 (i int not null, unique key(i)) engine=innodb;
show warnings;
Level Code Message
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`i` int(11) NOT NULL,
UNIQUE KEY `i` (`i`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_uca1400_ai_ci
drop table t1;
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