如何在MySQL中订购字母数字列？
要订购具有“100X，“2Z”等）值的字母数字列，请使用ORDERBY。让我们首先创建一个表-
mysql> create table DemoTable -> ( -> StudentId varchar(100) -> );
使用插入命令在表中插入一些记录-
mysql> insert into DemoTable values('2X');
mysql> insert into DemoTable values('100Y');
mysql> insert into DemoTable values('100X');
mysql> insert into DemoTable values('2Z');
mysql> insert into DemoTable values('2Y');
mysql> insert into DemoTable values('100Z');使用select语句显示表中的所有记录-
mysql> select *from DemoTable;
输出结果
这将产生以下输出-
+-----------+ | StudentId | +-----------+ | 2X | | 100Y | | 100X | | 2Z | | 2Y | | 100Z | +-----------+ 6 rows in set (0.00 sec)
这是在MySQL中按字母数字列排序的查询-
mysql>select *from DemoTable order by (StudentId+0), right(StudentId, 1);
输出结果
这将产生以下输出-
+-----------+ | StudentId | +-----------+ | 2X | | 2Y | | 2Z | | 100X | | 100Y | | 100Z | +-----------+ 6 rows in set, 6 warnings (0.00 sec)