Mock_SQL Questions - Punya

Apples and Oranges

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+
+WITH APPLES AS
+( SELECT SALE_DATE, SOLD_NUM FROM SALES WHERE FRUIT='APPLES') ,
+
+ORANGES AS(SELECT SALE_DATE, SOLD_NUM FROM SALES WHERE FRUIT='ORANGES') 
+
+SELECT A.SALE_DATE, (A.SOLD_NUM-O.SOLD_NUM ) AS 'DIFF' FROM APPLES A JOIN ORANGES O ON A.SALE_DATE=O.SALE_DATE ORDER BY A.SALE_DATE;

Top Travellers

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+select u.name, IFNULL(sum(r.distance),0) as travelled_distance from users u left JOIN RIDES r on u.id=r.user_id group by r.user_id order by travelled_distance DESC, u.name ASC;