MySQL中按字符数排序的方法
要按字符数排序，请使用ORDERBY和LENGTH()方法。以下是语法-
select *from yourTableName order by LENGTH(yourColumnName) DESC;
让我们首先创建一个表-
mysql− create table DemoTable -> ( -> Name varchar(100) -> ); Query OK, 0 rows affected (0.50 sec)
使用插入命令在表中插入一些记录-
insert into DemoTable values('John');
insert into DemoTable values('Robert');
insert into DemoTable values('Bob');
insert into DemoTable values('David');使用select语句显示表中的所有记录-
select *from DemoTable;
输出结果
+--------+ | Name | +--------+ | John | | Robert | | Bob | | David | +--------+ 4 rows in set (0.00 sec)
以下是按字符数排序的查询-
select *from DemoTable order by LENGTH(Name) DESC;
输出结果
+--------+ | Name | +--------+ | Robert | | David | | John | | Bob | +--------+ 4 rows in set (0.00 sec)