ADDTIME('01:00:00.999999', '02:00:00.999998'); : ADDTIME « Date Time Functions « MySQL Tutorial

1. MySQL Tutorial
2. Date Time Functions
3. ADDTIME

mysql>
mysql>
mysql>
mysql> SELECT ADDTIME('01:00:00.999999', '02:00:00.999998');
+-----------------------------------------------+
| ADDTIME('01:00:00.999999', '02:00:00.999998') |
+-----------------------------------------------+
| 03:00:01.999997                               |
+-----------------------------------------------+
1 row in set (0.00 sec)

mysql>