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在MySQL查询中向列添加用户定义值

2024-05-20 10:24:05 548

让我们首先创建一个表-

mysql> create table DemoTable1847
     (
     GameStatus ENUM('PENDING','COMPLETED','CANCELLED')
     );
Query OK, 0 rows affected (0.00 sec)

使用Insert命令在表中插入一些记录

mysql> insert into DemoTable1847 values('PENDING');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1847 values('COMPLETED');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1847 values('CANCELLED');
Query OK, 1 row affected (0.00 sec)

使用select语句显示表中的所有记录

mysql> select * from DemoTable1847;

这将产生以下输出-

+------------+
| GameStatus |
+------------+
| PENDING    |
| COMPLETED  |
| CANCELLED  |
+------------+
3 rows in set (0.00 sec)

下面是在MySQL查询中向列添加用户定义值的查询

mysql> select * from DemoTable1847
     union all
     select 'REFUND';

这将产生以下输出-

+------------+
| GameStatus |
+------------+
| PENDING    |
| COMPLETED  |
| CANCELLED  |
| REFUND     |
+------------+
4 rows in set (0.00 sec)

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在MySQL查询中向列添加用户定义值

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