从MySQL中混合了字符和数字的列中排序字符值？
让我们首先创建一个表-
mysql> create table DemoTable -> ( -> Code varchar(20) -> );
使用插入命令在表中插入一些记录-
mysql> insert into DemoTable values('J23');
mysql> insert into DemoTable values('C13');
mysql> insert into DemoTable values('A61');
mysql> insert into DemoTable values('D56');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-
+------+ | Code | +------+ | J23 | | C13 | | A61 | | D56 | +------+ 4 rows in set (0.00 sec)
这是对字符值进行排序的查询-
mysql> select * from DemoTable -> order by left(Code,1), -> cast(substr(Code, 2) as unsigned);
这将产生以下输出-
+------+ | Code | +------+ | A61 | | C13 | | D56 | | J23 | +------+ 4 rows in set (0.05 sec)