Question

SELECT CollMstHdr.EntryNo, CollMstHdr.Date, PartyMst.PName, SUM(CollMstDtl.Amt)
FROM CollMstHdr
  INNER JOIN CollMstDtl ON CollMstHdr.EntryNo = CollMstDtl.EntryNo
  INNER JOIN PartyMst ON CollMstHdr.SPartyCd = PartyMst.PartyCd
group by CollMstHdr.EntryNo, CollMstHdr.Date, PartyMst.PName

根据CollMstHdr.EntryNo和CollMstHdr.Date，我想要Amt Amt，我有EntryNo和Date两个主键，但仅根据EntryNo得到Amt Sum。如何使用Group By Clouse当我们有两列作为主要的kays时。

Answer 1

首先按照表格结构执行连接。然后将列添加到要执行分组的 select和group by 子句中。

就像你想要在EntryNo和Date上进行分组一样，然后执行以下操作：

SELECT CollMstHdr.EntryNo, CollMstHdr.Date, SUM(CollMstDtl.Amt)
FROM CollMstHdr
  INNER JOIN CollMstDtl ON CollMstHdr.EntryNo = CollMstDtl.EntryNo
  INNER JOIN PartyMst ON CollMstHdr.SPartyCd = PartyMst.PartyCd
group by CollMstHdr.EntryNo, CollMstHdr.Date

如果您只想在EntryNo上进行分组，请执行以下操作：

SELECT CollMstHdr.EntryNo, SUM(CollMstDtl.Amt)
FROM CollMstHdr
  INNER JOIN CollMstDtl ON CollMstHdr.EntryNo = CollMstDtl.EntryNo
  INNER JOIN PartyMst ON CollMstHdr.SPartyCd = PartyMst.PartyCd
group by CollMstHdr.EntryNo

使用Composite键的聚合函数

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