What happens if we provide NULL as a parameter to the MySQL CHAR() function?

The MySQL CHAR() function ignores NULL if NULL is provided as a parameter. To understand it, consider the following example -

mysql> Select CHAR(65,66,67,NULL);
+---------------------+
| CHAR(65,66,67,NULL) |
+---------------------+
| ABC                 |
+---------------------+
1 row in set (0.00 sec)

mysql> Select CHAR(NULL,66,67,NULL);
+-----------------------+
| CHAR(NULL,66,67,NULL) |
+-----------------------+
| BC                    |
+-----------------------+
1 row in set (0.00 sec)

In both the above examples, the CHAR() function ignores NULL and converts the numeric value to a character value.

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