Mysql查看表中的约束

@Adrian

show create table <数据表名> \G；

mysql> create table tb_emp8
    -> (
    -> id int(11) primary key,
    -> name varchar(22) unique,
    -> deptId int(11) not null,
    -> salary float default 0,
    -> check(salary>0),
    -> foreign key(deptId) references tb_dept1(id)
    -> );
Query OK, 0 rows affected, 2 warnings (0.84 sec)

mysql> show create table tb_emp8\G
*************************** 1. row ***************************
       Table: tb_emp8
Create Table: CREATE TABLE `tb_emp8` (
  `id` int(11) NOT NULL,
  `name` varchar(22) DEFAULT NULL,
  `deptId` int(11) NOT NULL,
  `salary` float DEFAULT '0',
  PRIMARY KEY (`id`),
  UNIQUE KEY `name` (`name`),
  KEY `deptId` (`deptId`),
  CONSTRAINT `tb_emp8_ibfk_1` FOREIGN KEY (`deptId`) REFERENCES `tb_dept1` (`id`),
  CONSTRAINT `tb_emp8_chk_1` CHECK ((`salary` > 0))
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
1 row in set (0.00 sec)

mysql> desc tb_emp8;
+--------+-------------+------+-----+---------+-------+
| Field  | Type        | Null | Key | Default | Extra |
+--------+-------------+------+-----+---------+-------+
| id     | int(11)     | NO   | PRI | NULL    |       |
| name   | varchar(22) | YES  | UNI | NULL    |       |
| deptId | int(11)     | NO   | MUL | NULL    |       |
| salary | float       | YES  |     | 0       |       |
+--------+-------------+------+-----+---------+-------+
4 rows in set (0.00 sec)

来源：CSDN

作者：PIG_先生

链接：https://blog.csdn.net/qq_43228581/article/details/104757146

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mysql

table