RE: SQL question
- From: Freeman Robert - IL <FREEMANR@xxxxxxxx>
- To: 'Jesper Haure Norrevang ' <jhn.aida@xxxxxx>
- Date: Fri, 3 Dec 2004 11:18:00 -0600
I like this solution, very nice.
RF
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
To: geraldine_2@xxxxxxxxxxx
Cc: oracle-l@xxxxxxxxxxxxx
Sent: 12/3/2004 11:07 AM
Subject: Re: SQL question
Geraldine,
select a, b
from mytable
where a <= b
union
select b, a
from mytable
where b = a
In Set Theory the set (1, 2) is equal to (2, 1).
Relational databases are (more and less) good implementations of Set
Theory. Basicly you are asking for a Set of Sets. Quite interesting. May
be Lex has some comments on this?
Regards
Jesper Haure
----- Original Message -----
From: geraldine_2@xxxxxxxxxxx
Date: Friday, December 3, 2004 5:37 pm
Subject: SQL question
> Hi,
> I have the following table below
>
> SQL> select * FRom mytable;
> A B
> ---------- ----------
> 1 2
> 3 4
> 2 1
> 5 6
> 4 3
>
> 5 rows selected.
>
> and I like to get the following output:
>
> A B
> ---------- ----------
> 1 2
> 3 4
> 5 6
>
>
> basically (1,2) is the same as (2,1) and I would just like to
> display any of those combination just once.
>
> Not sure how I can write a SQL to extract the data. Can someone help.
>
> TIA.
>
> Geraldine
> --
> //www.freelists.org/webpage/oracle-l
>
--
//www.freelists.org/webpage/oracle-l
--
//www.freelists.org/webpage/oracle-l
Other related posts:
