Please help me. I m a beginner in Sql.

Question

Hi,
My database contains below informations.
scrip_code scrip_name client_code qty b_s
500100 TISCO 47198      1000 BUY
500100 TISCO 47198 1000 SELL
500101 RELCAPITAL 47198 1000 BUY
500101 RELCAPITAL 47198 1000 SELL
500102 RELIANCE 47198 1000 BUY
500103 SATYAM 47198 2000 BUY
I just want to write a query that will extract the net postion
of my current portfolio. For a particular scrip code buy qty minus sell qty
equals 0 then that should eliminate.
for above table i want the output as,
500102 RELIANCE 47198 1000 BUY
500103 SATYAM 47198 2000 BUY
Plz give me a help. I m a beginner in Sql.
thanks
rathish

Answer 1

Assuming the table is a transaction table, and not a summary table, if I do another transaction on the same stock:
SQL> INSERT INTO t VALUES (500101,'RELCAPITAL',47198,500,'BUY');
1 row created.
SQL> commit;
Commit complete.
SQL> SELECT scrip_code, scrip_name, client_code,
  2  MAX(DECODE(b_s,'BUY',qty,0)) - MAX(DECODE(b_s,'SELL',qty,0)) net
  3  FROM t
  4  GROUP BY scrip_code, scrip_name, client_code
  5  HAVING MAX(DECODE(b_s,'BUY',qty,0)) - MAX(DECODE(b_s,'SELL',qty,0)) <> 0;
SCRIP_CODE SCRIP_NAME      CLIENT_CODE        NET
    500102 RELIANCE              47198       1000
    500103 SATYAM                47198       2000I would use something more like:
SQL> SELECT scrip_code, scrip_name, client_code,
  2         SUM(decode(b_s,'BUY',qty,qty * -1)) net
  3  FROM t
  4  GROUP BY scrip_code, scrip_name, client_code
  5  HAVING SUM(decode(b_s,'BUY',qty,qty * -1))<> 0;
SCRIP_CODE SCRIP_NAME      CLIENT_CODE        NET
    500101 RELCAPITAL            47198        500
    500102 RELIANCE              47198       1000
    500103 SATYAM                47198       2000