查询出4份数据的created_time边界值

mysql> select date_add('2017-01-01',interval 125000 second) dt1,
    ->        date_add('2017-01-01',interval 2*125000 second) dt2,
    ->        date_add('2017-01-01',interval 3*125000 second) dt3,
    ->        max(created_time) dt4
    ->   from t_source;
+---------------------+---------------------+---------------------+---------------------+
| dt1                 | dt2                 | dt3                 | dt4                 |
+---------------------+---------------------+---------------------+---------------------+
| 2017-01-02 10:43:20 | 2017-01-03 21:26:40 | 2017-01-05 08:10:00 | 2017-01-06 18:53:20 |
+---------------------+---------------------+---------------------+---------------------+
1 row in set (0.00 sec)
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