在 MySQL 中按字符长度对字符串进行排序?
mysqlmysqli database
您可以借助 MySQL 中的 CHAR_LENGTH() 函数按字符长度进行排序。该函数返回以下字符串的字符数，即 4 −
AMIT
要按字符长度对字符串进行排序，以下是语法 −
select *from yourTableName order by CHAR_LENGTH(yourColumnName);
要理解上述概念，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)
使用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)
让我们按顺序显示上表中插入的所有记录。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)
以下查询按字符长度排列显示所有记录。如果列值的长度最小，则其优先级更高，并将首先显示。
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)
