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How to pass a selection from one database to another via dblink?


How to pass a selection from one database to another via dblink?

By : Mohan
Date : November 19 2020, 12:41 AM
Hope that helps I'm using PostgreSQL 8.4. I have two databases, call them db1 and db2. In the db1 database I have the table tbl1 which contains the following columns (all dates have timestamp without timezone format): , If you really need both tables join them:
code :
select date_from, date_to, count(*)
from
    dblink(conn_str, $$
        select registration_date
        from player
    $$) p (registration_date)
    inner join
    t on p.registration_date between t.date_from and t.date_to
group by date_from, date_to
select date_trunc('day', registration_date), count(*)
from player
group by 1
order by 1


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