RE: A SQL Question

From: Stephane Faroult <sfaroult_at_oriolecorp.com>
Date: Thu, 13 Mar 2003 06:34:49 -0800
Message-ID: <F001.00568EE4.20030313063449@fatcity.com>

>Hi SQL Developers,
>
>I have a table as follows:
>
>Col1 Col2
>----------------
>A B
>C D
>E F
>G H
>B A
>E F
>C D
>H G
>
>With a PK on (Col1, Col2).
>
>How do I write a SQL script to get following
>result?
>
>Col1 Col2
>--------------------
>A B
>B A
>C D
>D C
>E F
>F E
>G H
>H G
>
>Thanks for your help.
>
>- Kirti

Kirti,

   On your example 'ORDER BY COL1' should be enough :-). I have a solution which is not excellent (I dislike the way I prevent the query from returning too many rows), but seems to be working even when there is no transitivity. May at least give you an idea on which to start work :

select *
from (select *

      from T
      connect by col1 = prior col2
          and col1 > col2) x

where rownum <= (select count(*) from T) /

Regards,

Stephane Faroult
Oriole

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Author: Stephane Faroult
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Received on Thu Mar 13 2003 - 08:34:49 CST