我们如何将 CHAR_LENGTH() 函数与 MySQL WHERE 子句一起使用？

当 CHAR_LENGTH() 或 CHARACTER_LENGTH() 字符串函数与 WHERE 子句一起使用时，其返回的输出将取决于 WHERE 子句中给出的条件。例如，假设我们有一个名为“Student”的表，并且我们只想获取那些字符数小于 6 的姓名，那么我们可以编写以下查询 -

mysql> Select * from Student;

+------+---------+---------+-----------+
| Id   | Name    | Address | Subject   |
+------+---------+---------+-----------+
| 1    | Gaurav  | Delhi   | Computers |
| 2    | Aarav   | Mumbai  | History   |
| 15   | Harshit | Delhi   | Commerce  |
| 20   | Gaurav  | Jaipur  | Computers |
+------+---------+---------+-----------+

4 rows in set (0.10 sec)

mysql> Select Name, CHAR_LENGTH(Name) from student WHERE CHAR_LENGTH(Name)<6;

+-------+-------------------+
| Name  | CHAR_LENGTH(Name) |
+-------+-------------------+
| Aarav | 5                 |
+-------+-------------------+

1 row in set (0.00 sec)