How can we use CHAR_LENGTH() function with MySQL WHERE clause?

When the CHAR_LENGTH() or CHARACTER_LENGTH() string function is used with a WHERE clause, the output it returns will depend on the conditions given in the WHERE clause. For example, let's say we have a table called "Student" and we want to get only those names with less than 6 characters, then we can write the following query -

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)

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