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            "questionFrontendId": "1699",
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            "title": "Number of Calls Between Two Persons",
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            "exampleTestcases": "{\"headers\":{\"Calls\":[\"from_id\",\"to_id\",\"duration\"]},\"rows\":{\"Calls\":[[1,2,59],[2,1,11],[1,3,20],[3,4,100],[3,4,200],[3,4,200],[4,3,499]]}}",
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                "Create table If Not Exists Calls (from_id int, to_id int, duration int)",
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                "insert into Calls (from_id, to_id, duration) values ('2', '1', '11')",
                "insert into Calls (from_id, to_id, duration) values ('1', '3', '20')",
                "insert into Calls (from_id, to_id, duration) values ('3', '4', '100')",
                "insert into Calls (from_id, to_id, duration) values ('3', '4', '200')",
                "insert into Calls (from_id, to_id, duration) values ('3', '4', '200')",
                "insert into Calls (from_id, to_id, duration) values ('4', '3', '499')"
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