SQL MERGE error? [duplicate] - sql

Question

This question already has an answer here:
Msg 8672, Level 16, State 1, Line 1 The MERGE statement attempted to UPDATE or DELETE the same row more than once
(1 answer)
Closed 4 years ago.
Please see my below code - I am new to SQL and haven't seen this error before. Can someone advise as to where it is going wrong? The error I am getting is
(41669 row(s) affected) Msg 8672, Level 16, State 1, Line 41 The MERGE
statement attempted to UPDATE or DELETE the same row more than once.
This happens when a target row matches more than one source row. A
MERGE statement cannot UPDATE/DELETE the same row of the target table
multiple times. Refine the ON clause to ensure a target row matches at
most one source row, or use the GROUP BY clause to group the source
rows.
My code is below
DECLARE #FromDate DateTime = '31 jan 2018'
DECLARE #ToDate DateTime = '28 Feb 2018'
DECLARE #FromDate_In DateTime = #FromDate
DECLARE #ToDate_In DateTime = #ToDate
DECLARE #DirectDebit_In INT = 0
/**************************/
/* Agreement view */
/**************************/
SELECT
sag.[AgreementID]
,sca.CustomerID
,'Lost' AS [Type]
INTO #AgreementSet
FROM Money.dbo.[Fin_SS_TblAgreements] sag WITH (NOLOCK)
INNER JOIN Money.dbo.[Fin_SS_TblCustomersAgreements] [sca] WITH (NOLOCK) ON sca.DealID = sag.DealID AND sca.IsMasterCustomer = 1 AND sca.[SnapShot] = sag.[SnapShot]
INNER JOIN (
SELECT
sps.DealID
FROM Money.dbo.[Fin_SS_TblPaymentSchedule] sps WITH (NOLOCK, INDEX(IX_NC_Snapshot))
WHERE sps.[SnapShot] = #FromDate_In
GROUP BY sps.DealID
) sps ON sag.DealID = sps.DealID
WHERE sag.[SnapShot] = #FromDate_In
AND (sag.AgreementID IS NOT NULL)
AND ((sag.EndDate > sag.[SnapShot]) OR (sag.EndDate = sag.[SnapShot] AND sag.Autorenew = 1))
AND (sag.AgreementStartsOn <= sag.[SnapShot])
AND ( (#DirectDebit_In = 0 AND sag.ContractTypeID <> 3) OR (#DirectDebit_In = 1 AND sag.ContractTypeID = 3) OR (#DirectDebit_In = 3) )
DECLARE #MaxAgIDFrom INT
SELECT #MaxAgIDFrom = MAX(AgreementID) FROM Money.dbo.[Fin_SS_TblAgreements] WHERE [SnapShot] = #FromDate_In
DECLARE #MaxCIDFrom INT
SELECT #MaxCIDFrom = MAX(CustomerID) FROM #AgreementSet
MERGE INTO #AgreementSet L
USING (
SELECT
sag.[AgreementID]
,sca.CustomerID
,'New' AS [Type]
FROM Money.dbo.[Fin_SS_TblAgreements] sag WITH (NOLOCK)
INNER JOIN Money.dbo.[Fin_SS_TblCustomersAgreements] [sca] WITH (NOLOCK) ON sca.DealID = sag.DealID AND sca.IsMasterCustomer = 1 AND sca.[SnapShot] = sag.[SnapShot]
INNER JOIN (
SELECT
sps.DealID
FROM Money.dbo.[Fin_SS_TblPaymentSchedule] sps WITH (NOLOCK, INDEX(IX_NC_Snapshot))
WHERE sps.[SnapShot] = #ToDate_In
GROUP BY sps.DealID
) sps ON sag.DealID = sps.DealID
WHERE sag.[SnapShot] = #ToDate_In
AND (sag.AgreementID IS NOT NULL)
AND ((sag.EndDate > sag.[SnapShot]) OR (sag.EndDate = sag.[SnapShot] AND sag.Autorenew = 1))
AND (sag.AgreementStartsOn <= sag.[SnapShot])
AND ( (#DirectDebit_In = 0 AND sag.ContractTypeID <> 3) OR (#DirectDebit_In = 1 AND sag.ContractTypeID = 3) OR (#DirectDebit_In = 3) )
) N
ON L.AgreementID = N.AgreementID
WHEN MATCHED THEN
UPDATE SET [Type] =
CASE WHEN L.CustomerID = n.CustomerID THEN 'B/F'
ELSE 'Swap'
END
WHEN NOT MATCHED THEN
INSERT (AgreementID, CustomerID, [Type])
VALUES (n.AgreementID, n.CustomerID, n.[Type])

Answer 1

We get this very often.
This happens because of unique column that is being used in more than one row.
In your case this may be because of same agreementid for two or more different customers.
Check the data again and perform the same operation again.