Please convert this query to UPDATE query.

Question

   Hi Experts,

Answer 1

Hello 976208
You can update the columns only in the table which is assigned to the MERGE INTO keywords. -> In this case only in the WEB_SALE_EMP Table.
There is a possibility that you can update / Insert complex codes if and only if this is created as a VIEW!
So, in this case, because you do not have any view on the two tables ( WEB_SALE_EMP and WEB_DELIVERY WD ) you can only update the WEB_SALE_EMP table.
    MERGE INTO WEB_SALE_EMP WE
    USING
        SELECT
            WBE.SHIPNT_ID SHIPNT_ID, WBE.SHIPNT_SRC SHIPNT_SRC, WBE.WB_ID WB_ID, WBE.SHIPNO SHIPNO, WBE.TAG_NO TAG_NO,
            CAST(COALESCE(WD.VALUE,'0') AS NUMBER) WB_VAL,
            SUM(WBE.REV * WBE.AMOUNT) AS Sum_Rev
        FROM WEB_SALE_EMP WBE
        INNER JOIN WEB_DELIVERY WD ON (WBE.WB_ID = WD.PG_ID AND WD.OPERATION = 'DISCOUNT')
        WHERE SHIPMNT_TYPE ='AIR_DISPATCH'
              AND WB_ID = p_PG_ID
              AND SHIPNT_ID = 2
              AND DESCP IS NOT NULL
              AND SALE_CODE IS NOT NULL
              AND UNIT IS NOT NULL
        GROUP BY SHIPNT_ID, SHIPNT_SRC, WB_ID, SHIPNO, TAG_NO,
            CAST(COALESCE(WD.VALUE,'0') AS NUMBER)
        HAVING SUM(WBE.REV * WBE.AMOUNT) > CAST(COALESCE(WD.VALUE,'0') AS NUMBER)
    )v
    ON( we.SHIPNT_ID = v.SHIPNT_ID
        AND we.SHIPNT_SRC = v.SHIPNT_SRC
        AND we.WB_ID = v.WB_ID
        AND we.SHIPNO = v.SHIPNO
        AND we.TAG_NO = v.TAG_NO
    WHEN MATCHED THEN
    UPDATE SET we.DELIVERY_TYPE = 'AIR'
    WHERE DESCP IS NOT NULL
        AND SALE_CODE IS NOT NULL
        AND UNIT IS NOT NULL
        AND we.WB_ID = 9
        AND we.SHIPNT_ID = 3;
Without these columns should your sql works.
I hope this helps you.
Regards,
David
IMPORTANT: Please use always QUALIFIED Column-names in a complex sql code!  (Example: wb_id = ... is bad! -> Good:  TABLE_ALIAS.wb_id = .... !)