Need Help in tuning of the query

Question

Hi all,
Can any body help me how we can rewrite this query in
optimized way.
SELECT A.C1 AS COLUMN_1, B.C2 AS COLUMN_2
FROM A,B
WHERE A.C1 IN (
SELECT COLUMN_1 FROM(
(SELECT A.C1 AS COLUMN_1,
COUNT(C1) AS COUNT,
RANK() OVER (ORDER BY COUNT(C1) DESC) AS RANK
FROM A, B, C
WHERE A.C1 = B.C3
AND B.C2 = C.C1
AND <other conditions>
GROUP BY A.C1)
WHERE RANK <= 10)
AND A.C1 = B.C3
AND <other conditions>
ORDER BY A.C1
I am using <other conditions> are same in outer query and inner query also.
Thanks in Advance,

Answer 1

Hi,
Yes exactly I am looking TOP-10 results the query is like this
SELECT A.C1 AS COLUMN_1, B.C2 AS COLUMN_2
FROM A,B
WHERE B.C2 IN (
SELECT COLUMN_1 FROM(
(SELECT B.C2 AS COLUMN_1,
COUNT(A.C1) AS COUNT,
RANK() OVER (ORDER BY COUNT(C1) DESC) AS RANK
FROM A, B, C
WHERE A.C1 = B.C3
AND B.C2 = C.C1
AND <other conditions>
GROUP BY B.C2)
WHERE RANK <= 10)
AND A.C1 = B.C3
AND <other conditions>
ORDER BY B.C2
Thanks