What does the MySQL MAKE_SET() function return if all positions in the string are NULL?

If the string is all NULL, the MySQL MAKE_SET() function will not return anything. The following example will demonstrate it -

Example

mysql> Select MAKE_SET(2, NULL,NULL,NULL);
+-----------------------------+
| MAKE_SET(2, NULL,NULL,NULL) |
+-----------------------------+
|                             |
+-----------------------------+
1 row in set (0.00 sec)

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