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-- create table users (user_id integer); insert into users values (1),(2); create table purchases (user_id integer, purchase_date date); insert into purchases (user_id, purchase_date) values (1, date '2020-06-01'), (1, date '2020-06-10'), (1, date '2020-06-11'), (1, date '2020-06-14'), (1, date '2020-06-17'), (2, date '2020-05-01'), (2, date '2020-05-10'), (2, date '2020-05-20'), (2, date '2020-05-28'), (2, date '2020-06-17') ;
2 rows affected
10 rows affected
select * from users u where exists (select * from ( select count(*) over (partition by user_id order by purchase_date range between interval '6 day' preceding and current row) as num_purchases from purchases p where p.user_id = u.user_id ) t where num_purchases >= 3)
user_id
1