Friend Requests I: Overall Acceptance Rate

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Example Testcases:

{"headers":{"FriendRequest":["sender_id","send_to_id","request_date"],"RequestAccepted":["requester_id","accepter_id","accept_date"]},"rows":{"FriendRequest":[[1,2,"2016/06/01"],[1,3,"2016/06/01"],[1,4,"2016/06/01"],[2,3,"2016/06/02"],[3,4,"2016/06/09"]],"RequestAccepted":[[1,2,"2016/06/03"],[1,3,"2016/06/08"],[2,3,"2016/06/08"],[3,4,"2016/06/09"],[3,4,"2016/06/10"]]}}