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;

Customer Who Bought All Products

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+select distinct(c.customer_id) from customer c right join product p on c.product_key=p.product_key group by c.customer_id having count( distinct p.product_key) = (select count(distinct(product_key)) from product)

Market Analysis II

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+with cte as(
+    select o.order_date, o.item_id, o.seller_id, rank() over (partition by o.seller_id order by o.order_date) as 'rank' from orders o
+),
+ACTE AS
+(select  c.item_id, c.seller_id , i.item_brand from cte c join items i on c.item_id=i.item_id where c.rank=2) 
+
+select u.user_id as 'seller_id',
+CASE
+    when a.item_brand = u.favorite_brand then 'yes' 
+    else 'no' 
+END as '2nd_item_fav_brand'  from ACTE a right join users u on a.seller_id=u.user_id

Sales Analysis III

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+WITH cte AS (
+    SELECT 
+        product_id, 
+        year, 
+        quantity, 
+        price,
+        RANK() OVER (PARTITION BY product_id ORDER BY year ASC) AS rnk
+    FROM Sales
+)
+SELECT 
+    product_id, 
+    year AS first_year, 
+    quantity, 
+    price
+FROM cte
+WHERE rnk = 1;

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;

Tournament Winners

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+
+with cte as(
+    select first_player as player_id, sum(first_score) as total from (select first_player, first_score from matches
+    union all 
+    select second_player, second_score from matches) a group by first_player
+) ,
+
+acte as (select c.player_id, p.group_id, c.total , row_number() over (partition by p.group_id order by c.total desc ,c.player_id ASC) as rnk from cte c join players p on 
+c.player_id=p.player_id)
+
+select group_id, player_id from acte where rnk=1;