[英]find users with overlapping subscription dates
I have a subscription table:我有一个订阅表:
user_id | start_date | end_date
1 1/1/2019 1/31/2019
2 1/15/2019 1/17/2019
3 1/29/2019 2/4/2019
4 2/5/2019 2/10/2019
I am looking to get the list of users with overlapping subscription with ANY of the other users.我正在寻找与任何其他用户重叠订阅的用户列表。
user_id overlap
1 True
2 True
3 True
4 False
I tried this:我试过这个:
select u1.user_id,
case when u1.end_date > u2.start_date and u1.start_Date < u2.end_date
then 'True'
else 'False' end as overlap
from subscriptions u1
join subscriptions u2
on u1.user_id <> u2.user_id
but it gives me following results:但它给了我以下结果:
1 True
1 True
1 False
2 True
2 False
2 False
3 True
3 False
3 False
4 False
4 False
4 False
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