Question

我被要求根据Enddate和CD_TYPE_COMMENTS字段对TX_Comments进行分组。输出应该是每CD_TYPE_COMMENTS和Enddate

的最新行

ID_EMPLOYEE ID_HEALTH_ASSESSMENT         CD_TYPE_COMMENT    ENDDATE TX_COMMENT
0M00910044  37754   Validation          18.06.2013          Record validated.
0M00910044  37754   Validation          20.05.2013          Record validated.
0M00910044  37754   Result              26.07.2013          Created.
0M00910044  37754   Appointment         18.06.2013          Pls cancel due to                        work commitments.  
0M00910044  37754   Appointment         25.06.2013          Confirmed (via Import)
0M00910044  37754   Ellipse Difference  23.07.2013  The following Employee Details have been updated:
0M00910044  37754   General             26.07.2013  Record complete
0M00910044  37754   Validation          20.05.2013  Record created.
0M00910044  37754   Appointment         09.07.2013  As advised by Mick Maskell. To be rescheduled to another date.
0M00910044  37754   Appointment         09.07.2013  Late cancellation charges will apply.
0M00910044  37754   Appointment         09.07.2013  Confirmed (via Import)
0M00910044  37754   Ellipse Difference  23.07.2013  The following Employee Details have been updated and should be checked for impact on this HA:
0M00910044  37754   Validation          20.05.2013  Manually created due to import exception error - Test Type could not be determined. Create HA manually. Has a valid RISI.
0M00910044  37754   Appointment         25.06.2013  Preferences provided.
0M00910044  37754   Ellipse Difference  04.07.2013  The following Employee Details have been updated and should be checked for impact on this HA:
0M00910044  37754   Validation          09.07.2013  Record validated.
0M00910044  37754   Appointment         18.06.2013  Cancelled (by Railcorp)
0M00910044  37754   Appointment         09.07.2013  Cancelled (by Railcorp)
0M00910044  37754   Appointment         24.05.2013  Preferences provided.
0M00910044  37754   Appointment         28.05.2013  Confirmed (via Import)
0M00910044  37754   Appointment         09.07.2013  Preferences provided.

Answer 1

如果您想要最后一行，那么您不希望聚合数据。你只想选择最后一个。

这是一种方法：

select t.*
from t
where t.enddate = (select max(t2.enddate)
                   from t t2
                   where t2.CD_TYPE_COMMENT = t.CD_TYPE_COMMENT
                  );

如果您确实希望每位员工都获得此信息，请在相关条款中包含and t2.Employee_ID = t.Employee_ID。

基于两个字段的组评论

1 个答案: