mysql 给表添加唯一约束、联合唯一约束,指定唯一约束的名字
2018-01-03 17:36
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表结构
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- FIELD TYPE COLLATION NULL KEY DEFAULT Extra PRIVILEGES COMMENT
- ------------- ------------ -------------- ------ ------ ------- -------------- -------------------- -------
- id BIGINT(20) (NULL) NO PRI (NULL) AUTO_INCREMENT SELECT,INSERT,UPDATE
- resource_name VARCHAR(128) gbk_chinese_ci YES (NULL) SELECT,INSERT,UPDATE
- resource_type TINYINT(4) (NULL) YES (NULL) SELECT,INSERT,UPDATE
给resource_name和resource_type添加联合唯一约束
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- ALTER TABLE jw_resource
- ADD UNIQUE KEY(resource_name, resource_type);
结果 show create table jw_resource;
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- CREATE TABLE `jw_resource` (
- `id` BIGINT(20) NOT NULL AUTO_INCREMENT,
- `resource_name` VARCHAR(128) DEFAULT NULL,
- `resource_type` TINYINT(4) DEFAULT NULL,
- PRIMARY KEY (`id`),
- UNIQUE KEY `resource_name` (`resource_name`,`resource_type`)
- ) ENGINE=INNODB AUTO_INCREMENT=2 DEFAULT CHARSET=gbk
删除唯一约束
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- ALTER TABLE jw_role DROP INDEX resource_name;
增加一个唯一约束,并且给唯一约束起名字?
原表结构:
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- mysql> show create table test_table;
- +------------+--------------------------------------------------------------------------------------------------------------------------------------------
- ---------------------------------+
- | Table | Create Table
- |
- +------------+--------------------------------------------------------------------------------------------------------------------------------------------
- ---------------------------------+
- | test_table | CREATE TABLE `test_table` (
- `id` int(50) NOT NULL AUTO_INCREMENT,
- `kk` varchar(30) DEFAULT NULL,
- PRIMARY KEY (`id`)
- ) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=latin1 |
- +------------+--------------------------------------------------------------------------------------------------------------------------------------------
- ---------------------------------+
- 1 row in set (0.00 sec)
增加唯一约束的语句,给唯一约束起名叫做 kk_uq:
[html] view plain copy
- mysql> alter table test_table add unique key `kk_uq` ( kk);
查看结果
[html] view plain copy
- mysql> show create table test_table;
- +------------+--------------------------------------------------------------------------------------------------------------------------------------------
- --------------------------------------------------------------+
- | Table | Create Table
- |
- +------------+--------------------------------------------------------------------------------------------------------------------------------------------
- --------------------------------------------------------------+
- | test_table | CREATE TABLE `test_table` (
- `id` int(50) NOT NULL AUTO_INCREMENT,
- `kk` varchar(30) DEFAULT NULL,
- PRIMARY KEY (`id`),
- UNIQUE KEY `kk_uq` (`kk`)
- ) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=latin1 |
- +------------+--------------------------------------------------------------------------------------------------------------------------------------------
- --------------------------------------------------------------+
- 1 row in set (0.00 sec)
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