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MySQL IF / WHEN / ELSE / OR与ORDER BY FIELD

2024-05-13 13:52:03 409

让我们首先创建一个表-

mysql> create table DemoTable1884
   (
   Marks int
   );

使用插入命令在表中插入一些记录-

mysql> insert into DemoTable1884 values(55);
mysql> insert into DemoTable1884 values(97);
mysql> insert into DemoTable1884 values(79);
mysql> insert into DemoTable1884 values(87);

使用插入命令在表中显示一些记录-

mysql> select * from DemoTable1884;

这将产生以下输出-

+-------+
| Marks |
+-------+
|    55 |
|    97 |
|    79 |
|    87 |
+-------+
4 rows in set (0.00 sec)

这是field()使用OR实施订单的查询：

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)

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MySQL IF / WHEN / ELSE / OR与ORDER BY FIELD

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