Question

Is this a good candidate for a MERGE command?

Must the source data also be another table or can it be variables that are passed?

If it must be a table, is inserting the passed variables into a temp table sane?

Could you help me with the syntax?

CREATE PROCEDURE [dbo].[usp_ConvertToMerge]
    @GL_DT           date
    ,@SRC_SYS_ID     varchar(60)
    ,@MLR_SRC_SYS_CD char(3)
    ,@TRSRY_FEED_DT  date
    ,@Data           varchar(20)
AS
    BEGIN
        IF NOT EXISTS (SELECT
                           @GL_DT
                       FROM
                           MLR_REBATE_IBOR_INFO_2
                       WHERE
                          [GL_DT] = @GL_DT
                          AND [SRC_SYS_ID]      = @SRC_SYS_ID
                          AND [MLR_SRC_SYS_CD]  = @MLR_SRC_SYS_CD
                          AND [TRSRY_FEED_DT]   = @TRSRY_FEED_DT)
            BEGIN
                INSERT INTO [dbo].[MLR_REBATE_IBOR_INFO_2]
                            ([GL_DT],
                             [SRC_SYS_ID],
                             [MLR_SRC_SYS_CD],
                             [TRSRY_FEED_DT],
                             [Data])
                SELECT
                    @GL_DT
                    ,@SRC_SYS_ID
                    ,@MLR_SRC_SYS_CD
                    ,@TRSRY_FEED_DT
                    ,@Data

            END
        ELSE
            BEGIN
                UPDATE [dbo].[MLR_REBATE_IBOR_INFO_2]
                SET    [Data] = @Data
                WHERE  [GL_DT] = @GL_DT
                       AND [SRC_SYS_ID]         = @SRC_SYS_ID
                       AND [MLR_SRC_SYS_CD]     = @MLR_SRC_SYS_CD
                       AND [TRSRY_FEED_DT]      = @TRSRY_FEED_DT
            END
    END

GO 

Answer 1

I think I did it:

CREATE PROCEDURE MyMergeTest
     @GL_DT             date
    ,@SRC_SYS_ID        char(20)     
    ,@MLR_SRC_SYS_CD    char(3)
    ,@TRSRY_FEED_DT     date
    ,@Data              varchar(20)
AS
BEGIN

    MERGE MLR_REBATE_IBOR_INFO_2 AS target
    USING 
        (
        SELECT 
             @GL_DT
            ,@SRC_SYS_ID
            ,@MLR_SRC_SYS_CD            
            ,@TRSRY_FEED_DT
            ,@Data
        ) AS source 
        (
             GL_DT
            ,SRC_SYS_ID
            ,MLR_SRC_SYS_CD            
            ,TRSRY_FEED_DT
            ,Data
        )

    ON (
        target.GL_DT            = source.GL_DT              AND
        target.SRC_SYS_ID       = source.SRC_SYS_ID         AND
        target.MLR_SRC_SYS_CD   = source.MLR_SRC_SYS_CD     AND
        target.TRSRY_FEED_DT    = source.TRSRY_FEED_DT 
        )
    WHEN MATCHED THEN 
        UPDATE SET Data = source.Data
    WHEN NOT MATCHED THEN   
        INSERT 
            (
            [GL_DT],
            [SRC_SYS_ID],
            [MLR_SRC_SYS_CD],
            [TRSRY_FEED_DT],
            [Data]
            )
        VALUES 
            (
            [GL_DT], --<<it looks like these can eiether be the variable eg, @GL_DT, or prefixed by 'source.'
            [SRC_SYS_ID],
            [MLR_SRC_SYS_CD],
            [TRSRY_FEED_DT],
            [Data]          
            );



END