MySQL选择顺序由像字符串（不是数字）组成？
如果您的列具有varchar数据类型，则可以使用以下语法-
select yourColumnName FROM yourTableName ORDER BY yourColumnName +0 DESC;
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 selectOrderdemo -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> Name varchar(100), -> RankNumber varchar(100) -> );
使用insert命令在表中插入一些记录。查询如下-
mysql> insert into selectOrderdemo(Name,RankNumber) values('Larry',-100);
mysql> insert into selectOrderdemo(Name,RankNumber) values('John',50);
mysql> insert into selectOrderdemo(Name,RankNumber) values('Bob',0);
mysql> insert into selectOrderdemo(Name,RankNumber) values('Carol',-110);
mysql> insert into selectOrderdemo(Name,RankNumber) values('David',98);这是查询的选择顺序，其作用类似于数字。
情况1-如果您希望结果按降序排列，查询如下-
mysql> select RankNumber FROM selectOrderdemo ORDER BY RankNumber+0 DESC;
这是输出-
+------------+ | RankNumber | +------------+ | 98 | | 50 | | 0 | | -100 | | -110 | +------------+ 5 rows in set (0.00 sec)
情况2-如果您希望结果按升序排列，查询如下-
mysql> select RankNumber FROM selectOrderdemo ORDER BY RankNumber+0;
这是输出-
+------------+ | RankNumber | +------------+ | -110 | | -100 | | 0 | | 50 | | 98 | +------------+ 5 rows in set (0.00 sec)
情况3-如果要所有列，请使用以下查询-
mysql> select * FROM selectOrderdemo ORDER BY RankNumber+0 DESC;
这是输出-
+----+-------+------------+ | Id | Name | RankNumber | +----+-------+------------+ | 5 | David | 98 | | 2 | John | 50 | | 3 | Bob | 0 | | 1 | Larry | -100 | | 4 | Carol | -110 | +----+-------+------------+ 5 rows in set (0.00 sec)