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help / color / mirror / Atom feedFrom: Voillequin, Jean-Marc <[email protected]>
To: Shaozhong SHI <[email protected]>
To: pgsql-sql <[email protected]>
Subject: RE: select only 1 pair
Date: Mon, 24 Oct 2022 14:59:56 +0000
Message-ID: <MN2PR20MB2735EC8F53206F809521AA16BE2E9@MN2PR20MB2735.namprd20.prod.outlook.com> (raw)
In-Reply-To: <CA+i5Jwa5VR7vJ=9S-9-d_3HgxQ_MmqwLW9+vqeN=jNDUVSVCHQ@mail.gmail.com>
References: <CA+i5Jwa5VR7vJ=9S-9-d_3HgxQ_MmqwLW9+vqeN=jNDUVSVCHQ@mail.gmail.com>
select id1,id2 from your_table where id2>=id1
union
select id2,id1 from your_table where id2<id1;
should work
From: Shaozhong SHI <[email protected]>
Sent: Monday, October 24, 2022 4:44 PM
To: pgsql-sql <[email protected]>
Subject: select only 1 pair
There are pair ids. Each pair is repeated. id1 id2 1 2 2 1 3 4 4 3 How to only select 1 unique pair for each? Regards, David
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There are pair ids. Each pair is repeated.
id1 id2
1 2
2 1
3 4
4 3
How to only select 1 unique pair for each?
Regards,
David
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Subject: RE: select only 1 pair
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