| From: | Matheus de Oliveira <matioli(dot)matheus(at)gmail(dot)com> |
|---|---|
| To: | Ron Johnson <ronljohnsonjr(at)gmail(dot)com> |
| Cc: | "pgsql-admin(at)lists(dot)postgresql(dot)org" <pgsql-admin(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: [EXTERNAL] Re: Need help with slow query - postgres 12 on linux RHEL 8 |
| Date: | 2023-12-28 20:17:10 |
| Message-ID: | CAJghg4JB-5GH=UOiXtjBsxfVq+Ud2SABww8CiDwLUeKcSox=Ew@mail.gmail.com |
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| Lists: | pgsql-admin |
On Thu, Dec 28, 2023 at 4:42 PM Ron Johnson <ronljohnsonjr(at)gmail(dot)com> wrote:
> On Thu, Dec 28, 2023 at 2:38 PM Matheus de Oliveira <
> matioli(dot)matheus(at)gmail(dot)com> wrote:
> [snip]
>
>> PS: As said in the other thread, a primary key on (granule_uuid, file_id)
>> would make more sense, but you need to get rid of null values on these rows
>> before creating the PK.
>>
>
> Can't you create a unique index index on fields with nulls?
>
Yes, you can create an unique index on fileds with nulls. But not a primary
key, a primary key requires that all fiedls are NOT NULL.
Best regards,
--
Matheus de Oliveira
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