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Re: Thoughts on a cosntraint ? - Mailing list pgsql-general

From John W Higgins
Subject Re: Thoughts on a cosntraint ?
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Msg-id CAPhAwGz17hBnKdnMoZZAx=9Edkn5ih2rzJFEhQhGx+vopnWrCQ@mail.gmail.com
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In response to Thoughts on a cosntraint ?  (stan <stanb@panix.com>)
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On Sun, Sep 29, 2019 at 12:40 PM stan <stanb@panix.com> wrote:
I have a table that consists of 3 columns.

vendor_key
mfg_key
preferred (boolean)

The idea is that a given vendor is the vendor we want to use for each
manufacturer for a given project.

I need to constrain such that  only on row of mfg, vendor and project can
be set to TRUE.


Partial unique index

Example 3 on this page https://www.postgresql.org/docs/current/indexes-partial.html is exactly what you are looking for.

John W Higgins

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