Merge.. When Matched... Query... please help...!!

Question

Hello Friends - With following details, can some one help me in writing a MERGE query, when Matched update ArtsDate and when not Matched Insert new rwo in CE Table.
PT: Parameter Table
MSO
1
2
5
6
FO Table          
MSO     EngModel     
1     RM713     
2     TT344     
3     TT189     
4     TT349     
5     RM735     
6     TT119     
7     RM734     
8     RM710     
SCH Table          
MsO     SchDate     SchSlot
1     10/18/2012     1
2     3/16/2012     4
3     12/13/2011     7
4     12/14/2011     4
5     12/15/2011     2
6     12/19/2011     5
7     12/20/2011     8
8     12/5/2011 3
SD SafetyDays          
EngModel     SDays     
RM710     4     
RM713     9     
RM734     4     
RM735     4     
TT344     7     
TT119     8     
TT189     16     
TT349     16     
CE: Table that needs to be updated               
MSO     ARTSDate SchDate SchSlot
2     9/30/2012     3/16/2012     4
4     4/26/2012     12/14/2011     4
5     10/15/2012 12/15/2011     2
7     2/2/2012     12/20/2011     8
CE: Result (updated Table)               Remarks
MSO     ARTSDate SCHdaTE SchSlot     
2     3/23/2012 3/16/2012     4     matched
4     12/30/2011 12/14/2011     4     
5     12/19/2011 12/15/2011     2     matched
7     12/24/2011 12/20/2011     8     
1     10/27/2012 10/18/2012     1     not matched
6     12/27/2011 12/19/2011     5     not matched
Notes on updated CE Table in above table:
Match PT.MSO with CE.MSO
When matched (e.g. MSO# 2 & 5), Update ARTS per following:
1. Take SchDate for same MSO from SCH table
2. Add SD.Sdays from SafetyDays table that refers to same EngModel present in FO Table for the same MSO in SCH table
When not matched (e.g. MSO# 1 & 6), Insert new row into CE Table
VALUES:
SCH.MSO
ARTS (use same same formula as above)
SCH.SCH
SCH.SchSlot
Thanks for your help..
Sunil
Edited by: 865144 on Jun 10, 2011 12:38 PM
Edited by: 865144 on Jun 10, 2011 12:49 PM

Answer 1

Thanks a ton Ganesh for your help. This is what I created from the code (after needed modifications) you have given to me:
MERGE INTO cmopsexport tgt
USING (SELECT RA.factoryorderid, '030' recordcode, FO.ud_order_prty_code,
SCH.productionsequence, FO.frozen, FO.ud_orig_seq_schd_date,
SCH.productiondate, FO.ud_eng_mdl_no,
TO_CHAR (add_work_days(FO.resourceid, SCH.productiondate,
     (Select SafetyDays from UD_SafetyDays
     where ud_safetydays.effdate = (select max(SD.effdate) from UD_SafetyDays SD
     where SD.effdate <= FO.ud_order_rcvng_date
     AND TRIM(SD.EngModel) = TRIM(FO.ud_eng_mdl_no)
     and TRIM(FO.ud_eng_mdl_no) = trim(UD_SafetyDays.EngModel)
'YYYYMMDD'
) ud_calculated_arts,
FO.ud_lane
FROM ud_recalc_arts RA,
schedule SCH,
factoryorder FO
WHERE RA.factoryorderid = SCH.factoryorderid
AND SCH.factoryorderid = FO.factoryorderid
) src
ON (tgt.factoryorderid = src.factoryorderid)
WHEN MATCHED THEN
UPDATE
SET
tgt.recordcode = src.recordcode,
tgt.ud_order_prty_code = src.ud_order_prty_code,
tgt.productionsequence = src.productionsequence,
tgt.frozen = src.frozen,
tgt.ud_orig_seq_schd_date = src.ud_orig_seq_schd_date,
tgt.productiondate = src.productiondate,
tgt.ud_eng_mdl_no = src.ud_eng_mdl_no,
tgt.ud_calculated_arts = src.ud_calculated_arts,
tgt.ud_lane = src.ud_lane
WHEN NOT MATCHED THEN
INSERT
VALUES (src.factoryorderid, src.recordcode, src.ud_order_prty_code,
src.productionsequence, src.frozen, src.ud_orig_seq_schd_date,
src.productiondate, src.ud_eng_mdl_no, src.ud_calculated_arts,
src.ud_lane);
And the above works too!!
Thank you once again...
Sunil