Question

I have the table tblCollectionGameList

CREATE TABLE dbo.tblCollectionGameList
(
    ListID smallint IDENTITY(0,1) NOT NULL,
    CollectionID smallint NOT NULL,
    IncludedSectionID smallint NOT NULL,
    CONSTRAINT PK_CollectionGameList_ListID PRIMARY KEY CLUSTERED (ListID ASC),
    CONSTRAINT FK_CollectionGameList_SectionInfo FOREIGN KEY (CollectionID) REFERENCES dbo.tblSectionInfo (SectionID),
    CONSTRAINT FK_CollectionGameList_SectionInfo2 FOREIGN KEY (IncludedSectionID) REFERENCES dbo.tblSectionInfo (SectionID)
)

which I run the following MERGE command on after passing an XML set of values to from my website

SELECT 
   CAST(colx.query('data(CollectionID) ') AS varchar) AS CollectionID,
   CAST(colx.query('data(IncludedSectionID) ') AS varchar) AS IncludedSectionID
INTO #TEMPtblCollectionGameList
FROM @XMLTable.nodes('DocumentElement/XMLTable') AS Tabx(Colx)

MERGE dbo.tblCollectionGameList AS t
USING #TEMPtblCollectionGameList AS s
ON (t.CollectionID = s.CollectionID AND t.IncludedSectionID= s.IncludedSectionID)
WHEN NOT MATCHED BY TARGET
    THEN
        INSERT (CollectionID, IncludedSectionID)
        VALUES (s.CollectionID, s.IncludedSectionID)
WHEN NOT MATCHED BY SOURCE
    THEN
        DELETE
;

which is not working right. If I have an existing set of data in my table:

ListID  CollectionID    IncludedSectionID
34      86              0
35      86              1

and I try to place new data from my web page for a collection with a different CollecitonID it is removing the old data and placing the new data in:

ListID  CollectionID    IncludedSectionID
38      92              10
39      92              11

what is wrong with my MERGE code that is making it affect items outside the CollectionID that the webpage is passing for an update?

Answer 1

The solution was to add the following:

WITH tblCGL AS
(
    SELECT ListID, CollectionID, IncludedSectionID
    FROM dbo.tblCollectionGameList AS CGL
    WHERE EXISTS
    (
        SELECT CollectionID, IncludedSectionID
        FROM #TEMPtblCollectionGameList AS TempCGL
        WHERE CGL.CollectionID = TempCGL.CollectionID
    )
)

this was gather by the help at the guys from SQLteam.com.