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mysql> select * from t_shuai45;
+----------+
| time |
+----------+
| 01:00:00 |
| 02:00:00 |
| 01:23:00 |
| 01:12:00 |
+----------+
4 rows in set (0.00 sec)
mysql> select SEC_TO_TIME(sum(TIME_TO_SEC(`time`))) from t_shuai45;
+---------------------------------------+
| SEC_TO_TIME(sum(TIME_TO_SEC(`time`))) |
+---------------------------------------+
| 05:35:00 |
+---------------------------------------+
1 row in set (0.00 sec)
mysql>