我正在使用MySQL进行以下查询：
SELECT id, from_unixtime(`timestamp`/1000, '%Y-%m-%d') as day_time, timestamp, end_timestamp, min((`end_timestamp`-`timestamp`)/60000) as min_diff_minutes from table1 WHERE imp<=130;
表格如下（此表只是原始表格的一小部分）：
+--------------+------------+---------------+---------------+
| id | day | timestamp | end_timestamp |
+--------------+------------+---------------+---------------+
| 71fce85098b9 | 2014-03-09 | 1394367994962 | 1394368030106 |
| 81fgr85093y6 | 2014-03-09 | 1394367950493 | 1394367993432 |
| 12rtw63423d1 | 2014-02-15 | 1394367302837 | 1394367783463 |
| 77grs82544e7 | 2014-01-21 | 1394367003472 | 1394367903843 |
+--------------+------------+---------------+---------------+
查询结果如下：
+--------------+------------+---------------+---------------+------------------+
| id | day | timestamp | end_timestamp | min_diff_minutes |
+--------------+------------+---------------+---------------+------------------+
| 71fce85098b9 | 2014-03-09 | 1394367994962 | 1394368030106 | -23359195.5028 |
+--------------+------------+---------------+---------------+------------------+
怎么可能有
-23359195.5028
MIN（）函数的结果，因为值＆＃34; min_diff_minutes ＆＃34;只是＆＃34; end_timestamp ＆＃34;的差异。使用＆＃34; 时间戳＆＃34;分为60000？
PS无论如何，值＆＃34; 时间戳＆＃34;和＆＃34; end_timestamp ＆＃34;属于 BIGINT 类型。