On Fri, Nov 25, 2022 at 7:50 AM Ron <ronljohnso...@gmail.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.
