Update rewrite for the query below

Question

UPDATE LAB_ST_SMRY LLS
SET (ST_CODE, ST_NAME, ST_DESC,IMAGE, ST_ID, ID, DIS_TYPE, ZIP_TYPE,
ACTE_IND, USER, UPDATE_DATE)
= (SELECT LLT.ST_CODE, LLT.ST_NAME, LLT.ST_DESC, LLT.IMAGE, LLT.ST_ID, LLT.ID,
LLT.ASSOC_DISC,1,1, 'LabWork', SYSDATE
FROM LAB_ST_TEMP LLT
INNER JOIN LAB_TEMP LT
ON LLT.ST_CODE=LT.ST_CODE
WHERE LLT.ST_ID=LLS.ST_ID
GROUP BY LLT.ST_CODE, LLT.ST_NAME, LLT.ST_DESC, LLT.IMAGE, LLT.ST_ID, LLT.ID,LLT.ASSOC_DISC
i am getting error that cannot update st_code to null.
I have 15 records in LAB_ST_SMRY
I have 20 records in LAB_ST_TEMP
when i am 8 records when i run the inner sql.
but when i run whole sql with the update statement i am getting error.
how can i re write this sql so that i will not get error

Answer 1

A merge statement would work
MERGE INTO lab_st_smry lls
USING (SELECT llt.st_code
             ,llt.st_name
             ,llt.st_desc
             ,llt.image
             ,llt.st_id
             ,llt.id
             ,llt.assoc_disc
         FROM lab_st_temp llt
         INNER JOIN lab_temp lt ON lt.st_code = llt.st_code) lu
   ON (lu.st_id = lls.st_id)
   WHEN MATCHED THEN
     UPDATE
        SET st_code = lu.st_code
           ,st_name = lu.st_name
           ,st_desc = lu.st_desc
           ,image = lu.image
           ,id = lu.id
           ,dis_type = lu.assoc_disc
           ,zip_type = 1
           ,acte_ind = 1
           ,user = 'LabWork'
           ,update_date = sysdate;You could also add a WHERE clause to what you have now to insure you don't try to update any rows that don't exist in the other table
UPDATE LAB_ST_SMRY LLS
SET (ST_CODE, ST_NAME, ST_DESC,IMAGE, ST_ID, ID, DIS_TYPE, ZIP_TYPE,
ACTE_IND, USER, UPDATE_DATE)
= (SELECT LLT.ST_CODE, LLT.ST_NAME, LLT.ST_DESC, LLT.IMAGE, LLT.ST_ID, LLT.ID,
LLT.ASSOC_DISC,1,1, 'LabWork', SYSDATE
FROM LAB_ST_TEMP LLT
INNER JOIN LAB_TEMP LT
ON LLT.ST_CODE=LT.ST_CODE
WHERE LLT.ST_ID=LLS.ST_ID
GROUP BY LLT.ST_CODE, LLT.ST_NAME, LLT.ST_DESC, LLT.IMAGE, LLT.ST_ID, LLT.ID,LLT.ASSOC_DISC
) WHERE st_id IN
    (SELECT llt.st_id FROM lab_st_temp llt JOIN lab_temp lt ON llt.st_code = lt.st_code)Edited by: kendenny on Jan 27, 2011 9:50 AM