Question

I want to return a result set (from postgres database) containing clients whose last payment date was more than X number of days ago.

This is what I have currently to get a list of all clients and their last payment date:

  select usermaster.userid, date_trunc('days', now()-max(paymentdate)) as last_payment
  from usermaster, paymentdetail 
  where usermaster.userid=paymentdetail.userid
  group by usermaster.userid;

I would like to limit with an extra where condition: where … and last_payment > 100 days

Answer 1

This should do the trick

EDIT –

select * from 
(SELECT usermaster.userid, date_trunc('days', now()-max(paymentdate)) as  
        last_payment
from usermaster, paymentdetail 
where usermaster.userid=paymentdetail.userid
group by usermaster.userid ) as temptab
where last_payment>100;