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MySQL ORDER BY和CASE WHEN

2024-05-02 19:55:04 480

为此，您可以使用ORDERBYCASE语句。让我们首先创建一个表-

mysql> create table DemoTable
order by with vas
Color varchar(100)
);

使用插入命令在表中插入一些记录-

mysql> insert into DemoTable values('Red');
mysql> insert into DemoTable values('Green');
mysql> insert into DemoTable values('Blue');
mysql> insert into DemoTable values('Yellow');

使用select语句显示表中的所有记录-

mysql> select *from DemoTable;

这将产生以下输出-

+--------+
| Color  |
+--------+
| Red    |
| Green  |
| Blue   |
| Yellow |
+--------+
4 rows in set (0.00 sec)

这是用CASEWHEN订购的查询-

mysql> select *from DemoTable
   order by case Color
   when 'Blue' then 10
   when 'Green' then 20
   when 'Yellow' then 30
   else 100 end ;

这将产生以下输出-

+--------+
| Color  |
+--------+
| Blue   |
| Green  |
| Yellow |
| Red    |
+--------+
4 rows in set (0.00 sec)

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MySQL ORDER BY和CASE WHEN

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