Subscription Overlap
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Given a table of product subscriptions with a subscription start date and end date for each user, write a query that returns true or false whether or not each user has a subscription date range that overlaps with any other completed subscription.
Completed subscriptions have end_date recorded.
Example:
Input:
subscriptions table
| Column | Type |
|---|---|
user_id |
INTEGER |
start_date |
DATETIME |
end_date |
DATETIME |
user_id |
start_date |
end_date |
|---|---|---|
| 1 | 2019-01-01 | 2019-01-31 |
| 2 | 2019-01-15 | 2019-01-17 |
| 3 | 2019-01-29 | 2019-02-04 |
| 4 | 2019-02-05 | 2019-02-10 |
Output:
user_id |
overlap |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 0 |
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