如何从MySQL的枚举中删除值？
使用ALTER命令从MySQL的枚举中删除一个值。让我们首先创建一个表-
mysql> create table DemoTable
(
`Rank` ENUM('LOW','MEDIUM','HIGH')
);
Query OK, 0 rows affected (0.52 sec)让我们检查表的描述。
mysql> DESC DemoTable;
这将产生以下输出-
+-------+-----------------------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+-----------------------------+------+-----+---------+-------+
| Rank | enum('LOW','MEDIUM','HIGH') | YES | | NULL | |
+-------+-----------------------------+------+-----+---------+-------+
1 row in set (0.00 sec)以下是从MySQL枚举中删除值的查询。
mysql> alter table DemoTable change `Rank` `Rank` ENUM('LOW','HIGH');
Query OK, 0 rows affected (1.19 sec)
Records: 0 Duplicates: 0 Warnings: 0现在让我们再次检查表的描述-
mysql> DESC DemoTable;
这将产生以下输出-
+-------+--------------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+--------------------+------+-----+---------+-------+
| Rank | enum('LOW','HIGH') | YES | | NULL | |
+-------+--------------------+------+-----+---------+-------+
1 row in set (0.00 sec)热门推荐
10 小红书平安祝福语简短
11 生日祝福语大全女孩简短
12 收生日红包祝福语 简短
13 领证幽默祝福语简短
14 法考面试祝福语简短
15 老哥出门祝福语简短语
16 送灯祝福语简短独特
17 幼儿狗年祝福语大全简短
18 好听的元旦简短祝福语