>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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