Postgres Query to get details before 2 months - sql

Question

I want to get the details of customers who has not visited for last two months by using postgresql. Below is my Query. I am getting all the data before 2months, but also wants to know whether the customer visits in between two months. If so, the result of query must not show that customer.
select usr.name,usr.mobile,ihv.create_date,ihv.partner_id from
invoice_header_view ihv join user_store_mapper usm on ihv.partner_id =
usm. partner_id join public.user usr on usr.user_id = usm.user_id
where usm.store_id = '123' and cast(ihv.create_date as date) =
cast(now() as date) - interval '2 month' and (cast(ihv.create_date as
date) between cast(ihv.create_date as date) and cast(now() as
date) - interval '2 months')

Answer 1

One of ways to solve it is NOT EXISTS. You can create a corelated subquery which will check if there are any newer rows in invoice_header_view.
Another way is to use GROUP BY, like
SELECT
usr.name, usr.mobile, ihv.partner_id,
max(ihv.create_date) AS max_create_date,
count(*) AS invoice_header_count
FROM invoice_header_view ihv
JOIN user_store_mapper usm ON ihv.partner_id = usm.partner_id
JOIN public.user usr ON usr.user_id = usm.user_id
WHERE
usm.store_id = '123'
AND ihv.create_date >= now() - interval '2 months'
GROUP BY
1,2,3
HAVING
max(ihv.create_date) <= now() - interval '2 months';

Answer 2

If you want customers whose most recent date is more than two months ago, then you can use:
SELECT u.name, u.mobile
FROM invoice_header_view ihv JOIN
user_store_mapper usm
ON ihv.partner_id = usm.partner_id JOIN
public.user u
ON u.user_id = usm.user_id
WHERE usm.store_id = 123 -- I'm guessing this really a number
GROUP BY u.name, u.mobile
HAVING max(ihv.create_date) <= curdate() - interval '2 months';