Re: Query planning around one key of a multi-column index

But so are you guys!

Thanks, this is helpful.

Is it really always true that querying off any column that's not the first
column of a multi-column index will NOT use that index?

On Wed, Dec 18, 2019 at 7:02 PM Craig James <cjames(at)emolecules(dot)com> wrote:

> Google is your friend:
>
> http://www.postgresqltutorial.com/postgresql-indexes/postgresql-multicolumn-indexes/
>
> On Wed, Dec 18, 2019 at 4:43 PM Wells Oliver <wells(dot)oliver(at)gmail(dot)com>
> wrote:
>
>> I've been using PG now for so many years and I don't have a solid
>> concrete answer on this in my head, and I feel like I should: if I have a
>> table with a multi-column index and I query on one of those columns (or
>> some subset of those columns), will it use that index?
>>
>> Is there more reading on this topic? I've always felt it's a little more
>> complicated but I'm not quite sure.
>>
>> --
>> Wells Oliver
>> wells(dot)oliver(at)gmail(dot)com <wellsoliver(at)gmail(dot)com>
>>
>
>
> --
> ---------------------------------
> Craig A. James
> Chief Technology Officer
> eMolecules, Inc.
> 3430 Carmel Mountain Road, Suite 250
> San Diego, CA 92121
> ---------------------------------
>

--
Wells Oliver
wells(dot)oliver(at)gmail(dot)com <wellsoliver(at)gmail(dot)com>