| From: | Sameer Kumar <sameer(dot)kumar(at)ashnik(dot)com> |
|---|---|
| To: | Steve Atkins <steve(at)blighty(dot)com> |
| Cc: | PG mailing List <pgsql-general(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: Case Insensitive |
| Date: | 2019-03-28 08:37:10 |
| Message-ID: | CADp-Sm5Yh=8wh9+dw49GW7vHHm9-4A_Qy42UzUaZVsVTQVTALQ@mail.gmail.com |
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| Thread: | |
| Lists: | pgsql-admin pgsql-general |
On Thu, 28 Mar, 2019, 4:33 PM Steve Atkins, <steve(at)blighty(dot)com> wrote:
>
>
> > On Mar 28, 2019, at 8:29 AM, Ron <ronljohnsonjr(at)gmail(dot)com> wrote:
> >
> > On 3/28/19 3:23 AM, Sameer Kumar wrote:
> > [snip]
> >> You can write a query with upper function:
> >>
> >> select * from emp where upper(ename)=upper('aaa');
> >
> > That's a guaranteed table scan.
>
> Unless you have an index on upper(ename).
>
Yup, with this or overloading "=", one can create an expression based index
and benefit from it.
> Cheers,
> Steve
>
>
>
>
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