Re: How to select unique records in PostgreSQL

On Fri, Nov 25, 2022 at 7:50 AM Ron <ronljohnsonjr(at)gmail(dot)com> wrote:

> Honestly, you do it *in PostgreSQL* the same way you do it in all the
> other SQL RDBMSs.
>

Emphasizing "in PostgreSQL" is nonsensical - it isn't like the OP specified
that they know how to do it in some other RDBMS and are trying to convert
their knowledge to PostgreSQL.

> On 11/24/22 06:01, Rama Krishnan wrote:
>
>
>
> I want to get the unique wallet_id from this table even it was repeated on
> multiple occasions I should calculate only once as well as if the wallet_id
> was calculated on previous month it shouldn't be calculate on next months
>
>
You need a subquery to compute the month in which each wallet_id should
appear (group by wallet_id with min(date) probably), then you can group on
the min(date) column and count the wallets.

David J.