我有下表
CREATE TABLE __EpiTest
(
`ActivityRecordID` int,
`ActCstID` varchar(6),
`ResCstID` varchar(6),
`VolAmt` int,
`ActCnt` int,
`TotOCst` int,
`TotCst` int
);
INSERT INTO __EpiTest (`ActivityRecordID`, `ActCstID`, `ResCstID`, `VolAmt`, `ActCnt`, `TotOCst`, `TotCst`)
VALUES (15652, 'DIM008', 'CPF005', 30.455249786377, 1, 0, 0.375024198767061),
(15652, 'DIM008', 'CSC004', 30.455249786377, 1, 7.62176510799961, 11.932578069479),
(15652, 'DIM008', 'REC001', 30.455249786377, 1, 0.17902367836393, 0.384881520159455),
(15652, 'OUT001', 'CPF002', 15, 0, 0, 16.9408193013078),
(15652, 'OUT001', 'CSC001', 15, 0, 2.36971564207042, 2.36971564207042),
(15652, 'OUT001', 'CSC004', 15, 0, 12.3230666021278, 12.3760690367354),
(15652, 'OUT001', 'REC001', 15, 0, 0.377459387378349, 3.0275278374102),
(15652, 'SUP001', 'CPF002', 1, 1, 0, 0.00108648359810756),
(15652, 'SUP001', 'CPF011', 1, 1, 0, -1.89799880202357E-14),
(15652, 'SUP001', 'CPF020', 1, 1, 0, 1.31058251625567E-05),
(15652, 'SUP001', 'CPF021', 1, 1, 0, 25.0942308512551),
(15652, 'SUP001', 'CPF021', 1, 1, 0, 25.0942308512551),
(15652, 'SUP001', 'CSC001', 1, 1, 1.9628769103451, 1.9628769103451),
(15652, 'SUP001', 'CSC001', 1, 1, 1.9628769103451, 1.9628769103451),
(15652, 'SUP001', 'CSC002', 1, 1, 0, 10.2266625467779),
(15652, 'SUP001', 'CSC004', 1, 1, 16.3451721608005, 16.3513319060046),
(15652, 'SUP001', 'CSC004', 1, 1, 16.3451721608005, 16.3513319060046),
(15652, 'SUP001', 'REC001', 1, 1, 0.254410386701976, -6.27048795659376),
(15652, 'SUP001', 'REC001', 1, 1, 0.254410386701976, -6.27048795659376),
(15652, 'SUP001', 'REC002', 1, 1, 0, 1.10781732547441);
请注意，有些行具有[ActivityRecordID]，[ActCstID]和[ResCstID]的匹配值。我想合并这些值并对[TotOCst]和[TotCst]中的值求和。为此，我尝试使用MERGE
MERGE [__EpiTest] AS Tgt
USING (
SELECT [ActivityRecordID],
[ActCstID],
[ResCstID],
SUM([TotOCst]) AS TotOCst,
SUM([TotCst]) AS TotCst
FROM [__EpiTest]
GROUP BY [ActivityRecordID],
[ActCstID],
[ResCstID]) AS Src
ON (Tgt.[ActivityRecordID] = Src.[ActivityRecordID] AND
Tgt.[ActCstID] = Src.[ActCstID] AND
Tgt.[ResCstID] = Src.[ResCstID])
WHEN MATCHED THEN
UPDATE
SET [TotOCst] = Src.[TotOCst],
[TotCst] = Src.[TotCst]
WHEN NOT MATCHED BY SOURCE THEN
DELETE;
GO
这会匹配并正确更新[TotOCst]和[TotCst]中每个副本的值，但它会在表格中留下重复的行，而我希望删除除了一个以外的所有行。我怎样才能做到这一点？
注意，目标表是巨大的，所以我想通过使用上面MERGE查询的变体或其他替代方法尝试通过单个操作执行此操作。多个查询对我来说太贵了......
插图
我得到了
...
15652 SUP001 CPF021 1 1 0 12.5471154256275
15652 SUP001 CPF021 1 1 0 12.5471154256275
15652 SUP001 CSC001 1 1 0.98143845517255 0.98143845517255
15652 SUP001 CSC001 1 1 0.98143845517255 0.98143845517255
15652 SUP001 CSC002 1 1 0 10.2266625467779
15652 SUP001 CSC004 1 1 8.17258608040024 8.17566595300228
15652 SUP001 CSC004 1 1 8.17258608040024 8.17566595300228
15652 SUP001 REC001 1 1 0.127205193350988 -3.13524397829688
15652 SUP001 REC001 1 1 0.127205193350988 -3.13524397829688
...
但我想要
...
15652 SUP001 CPF021 1 1 0 12.5471154256275
15652 SUP001 CSC001 1 1 0.98143845517255 0.98143845517255
15652 SUP001 CSC002 1 1 0 10.2266625467779
15652 SUP001 CSC004 1 1 8.17258608040024 8.17566595300228
15652 SUP001 REC001 1 1 0.127205193350988 -3.13524397829688
...
答案 0 :(得分：4)
为了在MERGE语句中使用它，您需要对行更具体一些。我已经调整了下面的查询：
MERGE [__EpiTest] AS Tgt
USING (
SELECT [ActivityRecordID],
[ActCstID],
[ResCstID],
SUM([TotOCst]) AS TotOCst,
SUM([TotCst]) AS TotCst ,
VolAmt,
ActCnt
FROM [__EpiTest]
GROUP BY [ActivityRecordID],
[ActCstID],
[ResCstID],
VolAmt,
ActCnt) AS Src
ON (Tgt.[ActivityRecordID] = Src.[ActivityRecordID] AND
Tgt.[ActCstID] = Src.[ActCstID] AND
Tgt.[ResCstID] = Src.[ResCstID] AND
Tgt.TotOCst = Src.TotOCst AND
Tgt.TotCst = Src.TotCst
)
WHEN NOT MATCHED BY TARGET THEN
INSERT ( ActivityRecordID, ActCstID, ResCstID, TotOCst, TotCst, VolAmt, ActCnt )
VALUES ( ActivityRecordID, ActCstID, ResCstID, TotOCst, TotCst, VolAmt, ActCnt )
WHEN NOT MATCHED BY SOURCE THEN
DELETE;
GO
基本上，我已对其进行了更改，以便合并源包含其他似乎不变的列，以便以后插入它们。我已将MATCH条件基本上改为＆＃34;行完全相同并且将保持不变＆＃34;并删除了WHEN MATCHED语句。
然后我添加了一个INSERT语句，以便对于那些已经改变的（将由NOT MATCHED BY TARGET删除它们的行），将插入一个带有这些值的新行。
在相同的数据中，这将返回以下结果集：
ActivityRecordID ActCstID ResCstID VolAmt ActCnt TotOCst TotCst
15652 DIM008 CPF005 30.455249786377 1 0 0.375024198767061
15652 DIM008 CSC004 30.455249786377 1 7.62176510799961 11.932578069479
15652 DIM008 REC001 30.455249786377 1 0.17902367836393 0.384881520159455
15652 OUT001 CPF002 15 0 0 16.9408193013078
15652 OUT001 CSC001 15 0 2.36971564207042 2.36971564207042
15652 OUT001 CSC004 15 0 12.3230666021278 12.3760690367354
15652 OUT001 REC001 15 0 0.377459387378349 3.0275278374102
15652 SUP001 CPF002 1 1 0 0.00108648359810756
15652 SUP001 CPF011 1 1 0 -1.89799880202357E-14
15652 SUP001 CPF020 1 1 0 1.31058251625567E-05
15652 SUP001 CSC002 1 1 0 10.2266625467779
15652 SUP001 REC002 1 1 0 1.10781732547441
15652 SUP001 CPF021 1 1 0 50.1884617025102
15652 SUP001 CSC001 1 1 3.9257538206902 3.9257538206902
15652 SUP001 CSC004 1 1 32.690344321601 32.7026638120092
15652 SUP001 REC001 1 1 0.508820773403952 -12.5409759131875
答案 1 :(得分：1)
__EpiTest中有重复值
SELECT * FROM @__EpiTest
where ResCstID = 'REC001' and ActCstID ='SUP001'
order by ActivityRecordID , ActCstID , ResCstID;
ActivityRecordID ActCstID ResCstID VolAmt ActCnt TotOCst TotCst
---------------- -------- -------- ----------- ----------- --------------------------------------- ---------------------------------------
15652 SUP001 REC001 1 1 0.2544103867 -6.2704879566
15652 SUP001 REC001 1 1 0.2544103867 -6.2704879566
简单选择单个值
SELECT DISTINCT * FROM @__EpiTest
where ResCstID = 'REC001' and ActCstID ='SUP001'
order by ActivityRecordID , ActCstID , ResCstID;
ActivityRecordID ActCstID ResCstID VolAmt ActCnt TotOCst TotCst
---------------- -------- -------- ----------- ----------- --------------------------------------- ---------------------------------------
15652 SUP001 REC001 1 1 0.2544103867 -6.2704879566
删除
删除重复的值并维护frist
;WITH cte as (
SELECT Row_number() OVER (PARTITION BY ActivityRecordID , ActCstID , ResCstID ORDER BY (SELECT NULL)) Rn, * FROM @__EpiTest
where ResCstID = 'REC001' and ActCstID ='SUP001'
)
Delete from cte where Rn > 1
SELECT * FROM @__EpiTest
where ResCstID = 'REC001' and ActCstID ='SUP001'
ActivityRecordID ActCstID ResCstID VolAmt ActCnt TotOCst TotCst
---------------- -------- -------- ----------- ----------- --------------------------------------- ---------------------------------------
15652 SUP001 REC001 1 1 0.2544103867 -6.2704879566
使用合并 - 请注意，合并附件存在严重的性能问题
;WITH myResult as (
SELECT Row_number() OVER (PARTITION BY ActivityRecordID , ActCstID , ResCstID ORDER BY (SELECT NULL)) Rn, * FROM @__EpiTest
)
MERGE myResult AS Tgt
USING myResult AS Src
ON (Tgt.[ActivityRecordID] = Src.[ActivityRecordID] AND
Tgt.[ActCstID] = Src.[ActCstID] AND
Tgt.[ResCstID] = Src.[ResCstID] AND
Tgt.Rn = Src.Rn AND
Src.Rn = 1)
WHEN MATCHED THEN
UPDATE
SET [TotOCst] = Src.[TotOCst],
[TotCst] = Src.[TotCst]
WHEN NOT MATCHED BY SOURCE THEN
DELETE;
SELECT * FROM @__EpiTest
where ResCstID = 'REC001' and ActCstID ='SUP001'
Rn ActivityRecordID ActCstID ResCstID VolAmt ActCnt TotOCst TotCst
-------------------- ---------------- -------- -------- ----------- ----------- --------------------------------------- ---------------------------------------
1 15652 SUP001 REC001 1 1 0.2544103867 -6.2704879566
2 15652 SUP001 REC001 1 1 0.2544103867 -6.2704879566
(2 row(s) affected)
(20 row(s) affected)
ActivityRecordID ActCstID ResCstID VolAmt ActCnt TotOCst TotCst
---------------- -------- -------- ----------- ----------- --------------------------------------- ---------------------------------------
15652 SUP001 REC001 1 1 0.2544103867 -6.2704879566