Merge in SQL Server 2017 - sql

Question

This is my query, I want to merge data from the source into the destination (I'm a beginner in SQL Server
DECLARE #T TABLE(NoContratAdhesion char(8) );
DECLARE #rqt as nvarchar (800000)
SET = 'SELECT *
FROM infocentre.[dbo].[TCtrCollRG] as RG
INNER JOIN SSIS_Temp.dbo.TLID_ADH_RG1_HUM AS RG1 ON RG.NoContratAdhesion = RG1.NoContratAdhesion'
USING (SELECT * FROM SSIS_Temp.dbo.Tmp_CollRG_sans_cle_HUM
WHERE Flag_doublons <> '1') AS SOURCE
ON (TARGET.Nocontratadhesion = SOURCE.NoContratAdhesion
AND TARGET.NoAvenant = SOURCE.NoAvenant
AND TARGET.CodeRG=SOURCE.CodeRG)
WHEN NOT MATCHED BY TARGET
THEN
INSERT ([NoContratAdhesion], [NoAvenant], [NoAdherent],
[CodeProduitCible], [CodeRG], [Optionnel], [Retenu],
[Retarde], [DateDebutValiditeRG], [DateFinValiditeRG],
[DateMajRG], [DateInsertPl], [DateMajPl], Date_CHARG_SIAD, FLAG_DELTA)
VALUES (SOURCE.[NoContratAdhesion], SOURCE.[NoAvenant], NULL,
SOURCE.[CodeProduitCible], SOURCE.[CodeRG], SOURCE.[Optionnel], SOURCE.[Retenu],
SOURCE.[Retarde], SOURCE.[DateDebutValiditeRG], SOURCE.[DateFinValiditeRG],
SOURCE.[DateMajRG], SOURCE.[DateInsertPl], SOURCE.[DateMajPl], GETDATE(), 'I')
WHEN MATCHED
THEN UPDATE SET
TARGET.[NoContratAdhesion]=SOURCE.[NoContratAdhesion]
,TARGET.[NoAvenant]=SOURCE.[NoAvenant]
,TARGET.[NoAdherent]=NULL
,TARGET.[CodeProduitCible]=SOURCE.[CodeProduitCible]
,TARGET.[CodeRG]=SOURCE.[CodeRG]
,TARGET.[Optionnel]=SOURCE.[Optionnel]
,TARGET.[Retenu]=SOURCE.[Retenu]
,TARGET.[Retarde]=SOURCE.[Retarde]
,TARGET.[DateDebutValiditeRG]=SOURCE.[DateDebutValiditeRG]
,TARGET.[DateFinValiditeRG]=SOURCE.[DateFinValiditeRG]
,TARGET.[DateMajRG]=SOURCE.[DateMajRG]
,TARGET.[DateInsertPl]=SOURCE.[DateInsertPl]
,TARGET.[DateMajPl]=SOURCE.[DateMajPl]
, TARGET.Date_CHARG_SIAD =getdate()
,TARGET.FLAG_DELTA='M'
WHEN NOT MATCHED BY SOURCE
THEN DELETE
OUTPUT Source.NoContratAdhesion
INTO #T;
DELETE infocentre.[dbo].[TCtrCollRG]
WHERE NoContratAdhesion in (SELECT NoContratAdhesion
FROM #T);
select count(*) from infocentre.[dbo].[TCtrCollRG]
I want to delete data if there are not in destination or update if exists, i tried this query but have errors.
Can you help me please?

Answer 1

nvarchar does not permit a length of 800000. Your set command does not describe what variable is being set. You have no merge clause to indicate what your target table is.
At minimum, you need to change this:
DECLARE #T TABLE(NoContratAdhesion char(8) );
DECLARE #rqt as nvarchar (800000)
set= 'SELECT * from infocentre.[dbo].[TCtrCollRG] as RG
INNER JOIN SSIS_Temp.dbo.TLID_ADH_RG1_HUM AS RG1 on RG.NoContratAdhesion=RG1.NoContratAdhesion'
USING (SELECT * from SSIS_Temp.dbo.Tmp_CollRG_sans_cle_HUM where Flag_doublons <> '1') AS SOURCE
ON (TARGET.Nocontratadhesion = SOURCE.NoContratAdhesion
and TARGET.NoAvenant = SOURCE.NoAvenant and TARGET.CodeRG=SOURCE.CodeRG)
into this:
DECLARE #T TABLE (NoContratAdhesion char(8));
DECLARE #rqt nvarchar(4000);
set #rqt = '
SELECT * from infocentre.[dbo].[TCtrCollRG] as RG
INNER JOIN SSIS_Temp.dbo.TLID_ADH_RG1_HUM AS RG1 on RG.NoContratAdhesion=RG1.NoContratAdhesion
';
merge #T target
USING (SELECT * from SSIS_Temp.dbo.Tmp_CollRG_sans_cle_HUM where Flag_doublons <> '1') AS SOURCE
ON TARGET.Nocontratadhesion = SOURCE.NoContratAdhesion
and TARGET.NoAvenant = SOURCE.NoAvenant and TARGET.CodeRG=SOURCE.CodeRG
After a cursory scan, I don't believe I see a major issue with the rest of your logic.
This is assuming you're in fact trying to merge from the real table into #T and not the other way around. Otherwise switch the merge and the using statements.