在 MySQL 中为列值设置 ENUM
mysqlmysqli database更新于 2023/10/24 14:10:00
创建表时，为需要 ENUM 值的列设置 ENUM 类型。让我们首先创建一个表−
mysql> create table DemoTable2019
-> (
-> StudentMarks int,
-> StudentStatus ENUM('First','Second','Fail')
-> );
Query OK, 0 rows affected (1.75 sec)
使用 insert 命令在表中插入一些记录 −
mysql> insert into DemoTable2019 values(96,'First'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable2019 values(28,'Fail'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable2019 values(45,'Second'); Query OK, 1 row affected (0.19 sec)
使用 select 语句显示表中的所有记录 −
mysql> select *from DemoTable2019;
这将产生以下输出 −
+--------------+---------------+ | StudentMarks | StudentStatus | +--------------+---------------+ | 96 | First | | 28 | Fail | | 45 | Second | +--------------+---------------+ 3 rows in set (0.00 sec)
以下是从具有 ENUM 列值的表中获取记录的查询 −
mysql> select *from DemoTable2019 -> where StudentMarks=28 -> order by StudentStatus limit 1;
这将产生以下输出 −
+--------------+---------------+ | StudentMarks | StudentStatus | +--------------+---------------+ | 28 | Fail | +--------------+---------------+ 1 row in set (0.00 sec)
