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From: Shaozhong SHI <[email protected]>
To: pgsql-sql <[email protected]>
Subject: select only 1 pair
Date: Mon, 24 Oct 2022 15:44:03 +0100
Message-ID: <CA+i5Jwa5VR7vJ=9S-9-d_3HgxQ_MmqwLW9+vqeN=jNDUVSVCHQ@mail.gmail.com> (raw)

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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