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MySQL按数字字符串排序？

2024-05-02 14:17:04 362

对于带数字的MySQL顺序字符串，以下是语法，其中我们使用了ORDERBY，SUBSTR()以及CAST()-

SELECT *FROM yourTableName ORDER BY
SUBSTR(yourColumnName FROM 1 FOR 2),
CAST(SUBSTR(yourColumnName FROM 2) AS UNSIGNED);

为了理解上述语法，让我们创建一个表。创建表的查询如下-

mysql> create table OrderByStringWithNumbers
   -> (
   -> Id int NOT NULL AUTO_INCREMENT,
   -> Words varchar(10),
   -> PRIMARY KEY(Id)
   -> );

使用insert命令在表中插入一些记录。查询如下-

mysql> insert into OrderByStringWithNumbers(Words) values('A10');

mysql> insert into OrderByStringWithNumbers(Words) values('A30');

mysql> insert into OrderByStringWithNumbers(Words) values('A12');

mysql> insert into OrderByStringWithNumbers(Words) values('A11');

mysql> insert into OrderByStringWithNumbers(Words) values('A28');

mysql> insert into OrderByStringWithNumbers(Words) values('A21');

使用select语句显示表中的所有记录-

mysql> select *from OrderByStringWithNumbers;

以下是输出-

+----+-------+
| Id | Words |
+----+-------+
| 1  | A10   |
| 2  | A30   |
| 3  | A12   |
| 4  | A11   |
| 5  | A28   |
| 6  | A21   |
+----+-------+
6 rows in set (0.00 sec)

这是按编号的字符串排序的查询-

mysql> select *from OrderByStringWithNumbers order by
   -> substr(Words from 1 for 2),
   -> cast(substr(Words from 2) AS UNSIGNED);

以下是输出-

+----+-------+
| Id | Words |
+----+-------+
| 1  | A10   |
| 4  | A11   |
| 3  | A12   |
| 6  | A21   |
| 5  | A28   |
| 2  | A30   |
+----+-------+
6 rows in set (0.00 sec)

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MySQL按数字字符串排序？

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