1
我从参加这样的程序MySQL的数据(表):登录注销考勤检查时间
+--------+--------------------+-----------+
| userid | checktime | checktype |
+-----------------------------+-----------+
| 1 | 26/04/2013 8:05:17 | I |
| 2 | 26/04/2013 8:05:17 | I |
| 2 | 26/04/2013 17:28:47| O |
| 3 | 26/04/2013 17:32:24| O |
+-----------------------------------------+
,我想预览这样的:
+--------+--------------------+---------------------+
| userid | Login time | Logout time |
+-----------------------------+---------------------+
| 1 | 26/04/2013 8:05:17 | Null |
| 2 | 26/04/2013 8:05:17 | 26/04/2013 17:28:47 |
| 3 | Null | 26/04/2013 17:32:24 |
+---------------------------------------------------+
我应该怎么写查询预览此输出?任何建议将是me.please帮助有帮助...
应该假设只能找到2个相同的userid,每个都有'I'或'O',对吗? –
用户3如何在不首先登录的情况下注销? –
就像司机一样,在下午结账。有时候人们忘记了登记(指纹程序)。时间表可以在班次表中找到 – empugandring