MySQL IF/WHEN/ELSE/OR 与 ORDER BY FIELD
mysqlmysqli database更新于 2024/1/9 13:59:00
首先我们创建一个表 −
mysql> create table DemoTable1884 ( Marks int ); 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 DemoTable1884 values(55); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1884 values(97); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1884 values(79); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1884 values(87); Query OK, 1 row affected (0.00 sec)
使用 insert 命令显示表中的一些记录 −
mysql> select * from DemoTable1884;
这将产生以下输出 −
+-------+ | Marks | +-------+ | 55 | | 97 | | 79 | | 87 | +-------+ 4 rows in set (0.00 sec)
下面是使用 OR 实现 order by field() 的查询:
mysql> select * from DemoTable1884 where Marks = 98 or Marks = 87 order by field(Marks,98,87) limit 1;
这将产生以下输出 −
+-------+ | Marks | +-------+ | 87 | +-------+ 1 row in set (0.00 sec)
