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1541-top-travellers/1541-top-travellers.sql
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+/* Write your PL/SQL query statement below */
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+SELECT U.name, NVL(SUM(R.distance), 0) AS travelled_distance
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+FROM Users U
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+LEFT JOIN Rides R
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+ON U.id = R.user_id
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+GROUP BY U.id, U.name
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+ORDER BY travelled_distance DESC, U.name
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