MySQL 如何排序一个包含字母和数字的列

要在一个包含“100X”、“2Z”等值的字母和数字列中排序，请使用ORDER BY。让我们先创建一个表 −

mysql> create table DemoTable
-> (
-> StudentId varchar(100)
-> );
Query OK, 0 rows affected (0.52 sec)

使用insert命令向表中插入一些记录 −

mysql> insert into DemoTable values('2X');
Query OK, 1 row affected (0.21 sec)

mysql> insert into DemoTable values('100Y');
Query OK, 1 row affected (0.20 sec)

mysql> insert into DemoTable values('100X');
Query OK, 1 row affected (0.12 sec)

mysql> insert into DemoTable values('2Z');
Query OK, 1 row affected (0.14 sec)

mysql> insert into DemoTable values('2Y');
Query OK, 1 row affected (0.23 sec)

mysql> insert into DemoTable values('100Z');
Query OK, 1 row affected (0.17 sec)

使用select语句从表中显示所有记录 −

mysql> select *from DemoTable;

阅读更多：MySQL 教程

输出

这将产生以下输出 −

+-----------+
| StudentId |
+-----------+
| 2X        |
| 100Y      |
| 100X      |
| 2Z        |
| 2Y        |
| 100Z      |
+-----------+
6 rows in set (0.00 sec)

以下是在MySQL中按字母数字列排序的查询 −

mysql>select *from DemoTable order by (StudentId+0), right(StudentId, 1);

输出

这将产生以下输出 −

+-----------+
| StudentId |
+-----------+
| 2X        |
| 2Y        |
| 2Z        |
| 100X      |
| 100Y      |
| 100Z      |
+-----------+
6 rows in set, 6 warnings (0.00 sec)