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MySQL ORDER BY CASE在开头显示特殊字符

2024-05-11 00:10:04 471

让我们首先创建一个表-

mysql> create table DemoTable
(
   StudentId varchar(40)
);

使用插入命令在表中插入一些记录-

mysql> insert into DemoTable values('10');
mysql> insert into DemoTable values(20);
mysql> insert into DemoTable values('~');
mysql> insert into DemoTable values(NULL);
mysql> insert into DemoTable values('40');
mysql> insert into DemoTable values(NULL);

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-

+-----------+
| StudentId |
+-----------+
| 10        |
| 20        |
| ~         |
| NULL      |
| 40        |
| NULL      |
+-----------+
6 rows in set (0.00 sec)

以下是对MySQL中特殊字符排序的查询-

mysql> select *from DemoTable
   order by case when StudentId not like '%[^a-zA-Z0-9]%' THEN 80
   when StudentId is null then 98
   else 85 end,StudentId;

这将产生以下输出-

+-----------+
| StudentId |
+-----------+
| ~         |
| 10        |
| 20        |
| 40        |
| NULL      |
| NULL      |
+-----------+
6 rows in set (0.03 sec)

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MySQL ORDER BY CASE在开头显示特殊字符

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