Re: Case Insensitive
| От | Sridhar N Bamandlapally |
|---|---|
| Тема | Re: Case Insensitive |
| Дата | |
| Msg-id | CAGuFTBVFBTowoOr9gjbB2kqnSQ0QVSDcEb8xhgvrAGNeuMbmxA@mail.gmail.com обсуждение исходный текст |
| Ответ на | Re: Case Insensitive (Sameer Kumar <sameer.kumar@ashnik.com>) |
| Список | pgsql-general |
With ILIKE or extension CITEXT, does it have any impact on Indexes, like not picking index ?
ILIKE works only for operator LIKE not for operator =
CITEXT seems some possibilities,
Thanks
Sridhar
On Thu, Mar 28, 2019 at 2:07 PM Sameer Kumar <sameer.kumar@ashnik.com> wrote:
On Thu, 28 Mar, 2019, 4:33 PM Steve Atkins, <steve@blighty.com> wrote:
> On Mar 28, 2019, at 8:29 AM, Ron <ronljohnsonjr@gmail.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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