Help in a query please

Question

POs PRs
po1 r1
po1 r1
po1 r1
po1 r1
po2 r1
po2 r3
po2 r4
po2 r4
From the above two columns (POs, PRs) table I want the result where for same 'poX' print only if it has different 'rX'
POs PRs
po2 r1
po2 r3
po2 r4
po2 r4
So it should not print those POx if it has same PRx.

Answer 1

Hi,
That sounds like a job for the analytic COUNT function.
Here's one way:
WITH     got_prs_cnt     AS
     SELECT  pos, prs
     ,     COUNT (DISTINCT prs)
              OVER (PARTITION BY pos)     AS prs_cnt  -- See note below
     FROM    table_x
SELECT     pos, prs
FROM     got_prs_cnt
WHERE     prs_cnt     > 1
I hope this answers your question.
If not, post a little sample data (CREATE TABLE and INSERT statements, relevant columns only) for all the tables involved, and the results you want from that data. Include examples of special cases that you need to handle (e.g., 3 rows with the same pos, and 2 disinct prs values).
Point out where the query above is producing the wrong results, and explain, using specific examples, how you get the right results from the given data in those places.
Always say what version of Oracle you're using (e.g. 11.2.0.2.0).
See the forum FAQ {message:id=9360002}
Edited by: Frank Kulash on May 2, 2013 6:40 AM
Changed "PARTITIION" (with 2 consecutive I's) to "PARTITION", after OP