| From: | Christophe Pettus <xof(at)thebuild(dot)com> |
|---|---|
| To: | pf(at)pfortin(dot)com |
| Cc: | pgsql-general(at)lists(dot)postgresql(dot)org |
| Subject: | Re: INSERT UNIQUE row? |
| Date: | 2023-07-09 23:02:14 |
| Message-ID: | 6669E40E-A427-4121-96FC-E4D90BFA6806@thebuild.com |
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| Thread: | |
| Lists: | pgsql-general |
A UNIQUE index can have any number of columns, so you can create an index with all of the appropriate columns listed. This is different from having a UNIQUE index on each individual column. In the former case, all of the columns together must be unique; in the latter case, as you mention, each index is evaluated separately.
> On Jul 9, 2023, at 15:58, pf(at)pfortin(dot)com wrote:
>
> Hi,
>
> Trying to figure out how to insert new property addresses into an
> existing table.
>
> Can a UNIQUE constraint be applied to an entire row? Adding UNIQUE to
> each column won't work in such a case since there are multiple properties
> * on the same street
> * in the same town
> * with the same number on different streets
> * etc...
>
> Each row is only unique as an entity; but the columns are not...
>
> Is this covered in the docs?
>
> Thanks,
> Pierre
>
>
>
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