Leetcode - 597. Friend Requests I: Overall Acceptance Rate

Indo Yoon -

문제

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정답

SELECT ROUND(IFNULL(
        (SELECT COUNT(*) FROM (SELECT DISTINCT requester_id, accepter_id FROM RequestAccepted) AS T1) /
        (SELECT COUNT(*) FROM (SELECT DISTINCT sender_id, send_to_id FROM FriendRequest) AS T2),
        0),2) AS accept_rate