MySQL Tutorial/Date Time Functions/PERIOD ADD
PERIOD_ADD(P,N) adds N months to period P (in the format YYMM or YYYYMM).
Returns a value in the format YYYYMM.
The period argument P is not a date value.
mysql>
mysql> SELECT PERIOD_ADD(9803,2);
+--------------------+
| PERIOD_ADD(9803,2) |
+--------------------+
| 199805 |
+--------------------+
1 row in set (0.00 sec)
mysql>
mysql>