Friend Request Acceptance Within 7 Days

SQL practice question · Hard · Analytics · Meta

A sender may resend a request to the same receiver; only the FIRST request of each (sender_id, receiver_id) pair counts, and it defines the request date and start time. A request is accepted within 7 days if `friend_accepts` has a row for the same (sender_id, receiver_id) direction with `accepted_at` between that first `sent_at` and exactly 7 days later (inclusive). Duplicate accept rows count once. Return `request_date` ('YYYY-MM-DD' of the first request), `requests`, `accepted_7d`, `acceptance_pct` (ROUND 1). Order by `request_date`.

Table: friend_requests

Schema of friend_requests
ColumnType
sender_idINTEGER
receiver_idINTEGER
sent_atTIMESTAMP
Sample rows of friend_requests
sender_idreceiver_idsent_at
122026-10-01 10:00:00
132026-10-01 11:00:00
422026-10-01 12:00:00
562026-10-02 09:00:00
572026-10-02 09:30:00

Table: friend_accepts

Schema of friend_accepts
ColumnType
sender_idINTEGER
receiver_idINTEGER
accepted_atTIMESTAMP
Sample rows of friend_accepts
sender_idreceiver_idaccepted_at
122026-10-02 08:00:00
132026-10-09 10:59:00
562026-10-09 09:00:00
422026-10-20 12:00:00
572026-10-01 09:00:00
Expected output on the sample data
request_daterequestsaccepted_7dacceptance_pct
2026-10-013133.3
2026-10-022150

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