MySQL IF()显示自定义的是或否消息

让我们首先创建一个表-

mysql> create table DemoTable1850 ( OrderStatus varchar(20) ); Query OK, 0 rows affected (0.00 sec)

使用Insert命令在表中插入一些记录

insert into DemoTable1850 values(Yes); insert into DemoTable1850 values(No); insert into DemoTable1850 values(Yes); insert into DemoTable1850 values(Yes);

使用select语句显示表中的所有记录

mysql> select * from DemoTable1850;

这将产生以下输出-

+-------------+ | OrderStatus | +-------------+ | Yes | | No | | Yes | | Yes | +-------------+ 4 rows in set (0.00 sec)

这是实现IF以显示自定义消息的查询：

mysql> select if(OrderStatus=Yes,Order has been placed,Failed) as Status from DemoTable1850;

这将产生以下输出-

+-----------------------+ | Status | +-----------------------+ | Order has been placed | | Failed | | Order has been placed | | Order has been placed | +-----------------------+ 4 rows in set (0.00 sec)