我在SQL中有两个表,我需要能够根据表B中的时间戳进行连接,该时间戳早于或等于表A中的时间戳.
所以,这里有两个表的假数据和所需的输出:
封闭案件(表A)
| id | resolution | timestamp | ------------------------------------------------ | 1 | solved | 2006-10-05 11:55:44.888153 | | 2 | closed | 2007-10-07 12:34:17.033498 | | 3 | trashed | 2008-10-09 08:19:36.983747 | | 4 | solved | 2010-10-13 04:28:14.348753 |
分类(表B)
| id | value | timestamp | ------------------------------------------------- | 1 | freshman | 2006-01-01 12:02:44.888153 | | 2 | sophomore | 2007-01-01 12:01:19.984333 | | 3 | junior | 2008-01-01 12:02:28.746149 |
期望的结果
| id | …