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What MySQL returns if the argument of QUOTE() function is NULL?

MySQL returns NULL if the argument of QUOTE() function is NULL.

Example

mysql> Select QUOTE(NULL);

+-------------+
| QUOTE(NULL) |
+-------------+
| NULL        
+-------------+

1 row in set (0.00 sec)

mysql> Select Name, QUOTE(NULL) from student where id = 1;

+--------+-------------+
| Name   | QUOTE(NULL) |
+--------+-------------+
| Gaurav | NULL        |
+--------+-------------+

1 row in set (0.08 sec)