Puzzling requirement --- SOS

Question

Hi experts ,
I need ur guidance i have two tables S1 and S2.Now we have three columns in it api_number well name and section.Remember the apinumber for both the column is one and same but some well names may be different .
I have written a stored procedure to update the table S1 w.r.t S2 well names but i have another requirement in which if some extra rows are added to the table S2 for the api number well names and section then the entries needs to be inserted into our table S1.As S1 has to be always updated w.r.t S2
I have modified the stored procedure but it doesn't work .Can anyone suggest me what changes i need to perform in the codes so as to achieve this requirement.
I am pasting my stored procedure as below.please make any change in the updation part for achieving the second requirement.
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CREATE PROCEDURE Job AS
cur_apinumber1 varchar(200);
cur_wellname1 varchar(200);
cur_apinumber2 varchar(200);
cur_wellname2 varchar(200);
CURSOR cur_T1 IS
SELECT api_number,
well_name
FROM s1;
CURSOR cur_T2 IS
SELECT api_number ,
well_name
FROM s2 ;
BEGIN
LOOP
--check if the cursor T1 is open or not
--If not then open the cursor
IF NOT cur_T1%ISOPEN THEN
OPEN cur_T1;
END IF;
IF cur_T1%ISOPEN THEN
--Fetching the values from cursor T1
FETCH cur_T1
INTO cur_apinumber1,
cur_wellname1;
LOOP
--check if the cursor T2 is open or not
--If not then open the cursor
IF NOT cur_T2%ISOPEN THEN
OPEN cur_T2;
END IF;
IF cur_T2%ISOPEN THEN
--Fetching the values from cursor T2
FETCH cur_T2
INTO cur_apinumber2,
cur_wellname2;
--Compare T2 with T1 and Update T1
BEGIN
IF (SUBSTR(cur_apinumber1,0,10) = SUBSTR(cur_apinumber2,0,10)) THEN
UPDATE s1
SET WELL_NAME= cur_wellname2
WHERE API_NUMBER = cur_apinumber1;
END IF;
ELSE
INSERT INTO s1
(SELECT * FROM s2 where cur_apinumber1= NULL);
END IF;
END;
--Closing the cursor for T2
IF cur_T2%NOTFOUND THEN
CLOSE cur_T2;
EXIT;
END IF;
END IF;
END LOOP;
--Closing the cursor for T1
IF cur_T1%NOTFOUND THEN
CLOSE cur_T1;
EXIT;
END IF;
END IF;
END LOOP;
[n]
Looking forward for the response on the same .
Thanks and Regards
Debashis

Answer 1

Hi satish ,
Thanks for your reply but can u be a bit explicit in ur reply.As i couldnt understand regarding the MERGE statement .Remember the table S1 has no constraint but S2 has a constraint called as unique key defined over api_number column .is it going to effect during the insertion of values and one more thing is my code and approach correct .If not can u please make any posible changes.
thanks
debashis