Question

Why this insert is not getting compiled :-

INSERT  INTO dbo.UserGroupsToUsers
                        ( UserID ,
                          LastUpdated ,
                          ID ,
                          UserGroupID 
                        )
                        SELECT  @MergeToUserID ,
                                GETDATE() ,
                                MAX(ID) + 1 ,
                                UserGroupID
                        FROM    dbo.UserGroupsToUsers
                        WHERE   UserID = @MergeFromUserID

Error: Column ‘dbo.UserGroupsToUsers.UserGroupID’ is invalid in the select list because it is not contained in an aggregate function and there is no GROUP BY clause.

Answer 1

You should make your ID field into an IDENTITY (autoincrementing field) and omit it from the query.

If you can’t change the database you could try this:

INSERT  INTO dbo.UserGroupsToUsers
                ( UserID ,
                  LastUpdated ,
                  ID ,
                  UserGroupID 
                )
                SELECT  @MergeToUserID ,
                        GETDATE() ,
                        (SELECT MAX(ID) + 1 FROM dbo.UserGroupsToUsers),
                        UserGroupID
                FROM    dbo.UserGroupsToUsers
                WHERE   UserID = @MergeFromUserID

Important note: This assumes that only one row will be returned. The insert will fail by design if your subquery returns more than one row and ID is a primary key or has a unique constraint.