不幸的是,我被困在某个点上,无法前进。
我来描述一下有什么问题。
结构:
Table [logs] -
logs.logs_id == mon.mon_id
logs.logs_status
logs.logs_updated
Table [monitoring] -
mon.mon_id
mon.mon_sid
mon.....
示例数据-
logs.logs_id | logs.logs_status | logs.logs_updated
1 1 2020/02/29 21:04:00
2 1 2020/02/29 21:04:00
3 1 2020/02/29 21:04:00
4 1 2020/02/29 21:04:00
5 1 2020/02/29 21:04:00
6 0 2020/02/29 21:04:00
1 1 2020/02/29 21:04:10
2 1 2020/02/29 21:04:10
3 1 2020/02/29 21:04:10
4 1 2020/02/29 21:04:10
5 1 2020/02/29 21:04:10
6 0 2020/02/29 21:04:10
1 1 2020/02/29 21:04:20
2 1 2020/02/29 21:04:20
3 1 2020/02/29 21:04:20
4 1 2020/02/29 21:04:20
5 1 2020/02/29 21:04:20
6 0 2020/02/29 21:04:20
1 1 2020/02/29 21:04:30
2 1 2020/02/29 21:04:30
3 1 2020/02/29 21:04:30
4 1 2020/02/29 21:04:30
5 1 2020/02/29 21:04:30
6 1 2020/02/29 21:04:30
1 1 2020/02/29 21:04:40
2 1 2020/02/29 21:04:40
3 1 2020/02/29 21:04:40
4 1 2020/02/29 21:04:40
5 1 2020/02/29 21:04:40
6 1 2020/02/29 21:04:40
1 1 2020/02/29 21:04:50
2 1 2020/02/29 21:04:50
3 1 2020/02/29 21:04:50
4 1 2020/02/29 21:04:50
5 1 2020/02/29 21:04:50
6 0 2020/02/29 21:04:50
1 1 2020/02/29 21:05:00
2 1 2020/02/29 21:05:00
3 1 2020/02/29 21:05:00
4 1 2020/02/29 21:05:00
5 0 2020/02/29 21:05:00
6 0 2020/02/29 21:05:00
mon.mon_sid | logs.logs_status | logs.logs_updated
YYY 0 2020/02/29 21:05:00
XXX 0 2020/02/29 21:04:50
XXX 1 2020/02/29 21:04:30
XXX 0 2020/02/29 21:04:00
由于根据数据只更改了log.mon_id==6和log.mon_id==5的状态,因此只应返回此状态。所以我有四行结果。
事先谢谢你的帮助,我很累想弄清楚。
