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法律研究使用数字对 MySQL 字符串进行排序？
要对带数字的 MySQL 字符串排序，以下是语法，其中我们使用了 ORDER BY、SUBSTR() 和 CAST() −
SELECT *FROM yourTableName ORDER BY SUBSTR(yourColumnName FROM 1 FOR 2), CAST(SUBSTR(yourColumnName FROM 2) AS UNSIGNED);
要理解上述语法，让我们创建一个表。创建表查询如下 −
mysql> create table OrderByStringWithNumbers -> ( -> Id int NOT NULL AUTO_INCREMENT, -> Words varchar(10), -> PRIMARY KEY(Id) -> ); Query OK, 0 rows affected (0.86 sec)
使用插入命令向表中插入一些记录。查询如下 −
mysql> insert into OrderByStringWithNumbers(Words) values('A10');
Query OK, 1 row affected (0.19 sec)
mysql> insert into OrderByStringWithNumbers(Words) values('A30');
Query OK, 1 row affected (0.19 sec)
mysql> insert into OrderByStringWithNumbers(Words) values('A12');
Query OK, 1 row affected (0.13 sec)
mysql> insert into OrderByStringWithNumbers(Words) values('A11');
Query OK, 1 row affected (0.17 sec)
mysql> insert into OrderByStringWithNumbers(Words) values('A28');
Query OK, 1 row affected (0.13 sec)
mysql> insert into OrderByStringWithNumbers(Words) values('A21');
Query OK, 1 row affected (0.20 sec)使用 select 语句从表中显示所有记录 −
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)
以下是按带数字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)
更新于：30-6-2020
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