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)