| From: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
|---|---|
| To: | JORGE MALDONADO <jorgemal1960(at)gmail(dot)com> |
| Cc: | pgsql-novice <pgsql-novice(at)postgresql(dot)org> |
| Subject: | Re: Unique Constraint vs Unique Index |
| Date: | 2020-05-05 20:32:29 |
| Message-ID: | 20200505203229.GA24500@alvherre.pgsql |
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| Lists: | pgsql-novice |
On 2020-May-05, JORGE MALDONADO wrote:
> I have been reading about "unique constraint" and "unique index" in
> PostgreSQL documentation and also did some search in Google. However, it is
> not very clear to me which one to use or when to use one or the other. I
> understand that a "unique constraint" creates a "unique index" under the
> hood. So, at the end, both will check for duplicate records based on the
> field(s) specified for the unique constraint and the unique index.
>
> What would be a guideline about when to use one or the other?
BTW you already asked this in October 2013 and got good answers.
https://postgr.es/m/CAAY=A78oJ--0aPm4E6ASJ32Z3UHk0nOqHQ_SvrtjOmq7i=UKDQ@mail.gmail.com
You had already asked in July 2013, too.
https://postgr.es/m/CAAY=A78V1gCxC6VEU4_G8e0XouT=c64RA2GaSfGE8MEy3=33_g@mail.gmail.com
--
Álvaro Herrera https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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