在 mYsql 中按字符长度对字符串进行排序？

您可以借助 MySQL 的 CHAR_LENGTH() 函数按字符长度排序。该函数返回字符数，即以下字符串的 4 个 -

AMIT

要按字符长度对字符串进行排序，语法如下 -

select *from yourTableName order by CHAR_LENGTH(yourColumnName);

为了理解上面的概念，让我们首先创建一个表。以下是创建表的查询 -

mysql> create table OrderByCharacterLength
   −> (
   −> BookName varchar(200)
   −> );
Query OK, 0 rows affected (1.97 sec)

借助insert命令在表中插入一些记录。查询如下 -

mysql> insert into OrderByCharacterLength values('Let us C');
Query OK, 1 row affected (0.31 sec)

mysql> insert into OrderByCharacterLength values('Introduction to C');
Query OK, 1 row affected (0.20 sec)

mysql> insert into OrderByCharacterLength values('Data Structure And Algorithm in Java ');
Query OK, 1 row affected (0.13 sec)

mysql> insert into OrderByCharacterLength values('C in Depth');
Query OK, 1 row affected (0.17 sec)

mysql> insert into OrderByCharacterLength values('Java Projects');
Query OK, 1 row affected (0.23 sec)

让我们按上表中插入的顺序显示所有记录。查询如下 -

mysql> select *from OrderByCharacterLength;

以下是输出 -

+---------------------------------------+
| BookName                              |
+---------------------------------------+
| Let us C                              |
| Introduction to C                     |
| Data Structure And Algorithm in Java  |
| C in Depth                            |
| Java Projects                         |
+---------------------------------------+
5 rows in set (0.00 sec)

这里是显示按照字符长度排列的所有记录的查询。如果列值具有最小长度，那么它将获得更高的优先级并首先显示。

查询如下 -

mysql> select *from OrderByCharacterLength order by CHAR_LENGTH(BookName);

以下是输出 -

+---------------------------------------+
| BookName                              |
+---------------------------------------+
| Let us C                              |
| C in Depth                            |
| Java Projects                         |
| Introduction to C                     |
| Data Structure And Algorithm in Java  |
+---------------------------------------+
5 rows in set (0.00 sec)

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