SQL4

LeagueStatistics1.sql

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+# Write your MySQL query statement below
+WITH CTE AS (
+    SELECT home_team_id as r1,
+    home_team_goals as goals_home,
+    away_team_goals as goals_away
+    FROM Matches
+    UNION ALL
+    SELECT away_team_id as r1,
+    away_team_goals as goals_home,
+    home_team_goals as goals_away 
+    FROM Matches
+)
+
+SELECT 
+    t.team_name,
+    COUNT(r1) AS matches_played,
+    SUM(CASE
+        WHEN c.goals_home > c.goals_away THEN 3
+        WHEN c.goals_home = c.goals_away THEN 1
+        ELSE 0
+    END) AS points,
+    SUM(c.goals_home) AS goal_for,
+    SUM(c.goals_away) AS goal_against,
+    SUM(c.goals_home) - SUM(c.goals_away) AS goal_diff
+    FROM Teams t
+    INNER JOIN
+    CTE c
+    ON t.team_id = c.r1
+    GROUP BY c.r1
+    ORDER BY points DESC, goal_diff DESC, t.team_name;

SalesPerson.sql

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+# Write your MySQL query statement below
+#-----------------------Using CTE--------------------------------------------------------
+WITH CTE AS(
+    SELECT o.sales_id
+    FROM
+    Orders o
+    LEFT JOIN
+    Company c
+    ON o.com_id = c.com_id
+    WHERE c.name = "RED"
+)
+SELECT s.name
+FROM SalesPerson s
+WHERE s.sales_id NOT IN (SELECT sales_id FROM CTE);
+#-----------------Using Subquery--------------------------------------------------------
+-- SELECT 
+--     s.name as 'name'
+-- FROM
+--     SalesPerson as s 
+--     WHERE s.sales_id NOT IN (
+--          SELECT o.sales_id
+--     FROM
+--     Orders o
+--     LEFT JOIN
+--     Company c
+--     ON o.com_id = c.com_id
+--     WHERE c.name = "RED"
+--     );

SeniorsJuniorstoJointhecompany.sql

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+WITH CTE AS (
+    SELECT employee_id, experience,
+    SUM(salary) OVER (PARTITION BY experience ORDER BY salary, employee_id) AS 'rsum'
+    FROM
+        candidates
+    )
+SELECT 
+    'Senior' AS experience, COUNT(employee_id) AS 'accepted_candidates' 
+FROM CTE
+WHERE experience = 'Senior' AND rsum <= 70000;
+UNION
+SELECT 'Junior' as experience, COUNT(employee_id) AS 'accepted_candidates'
+FROM CTE
+WHERE experience = 'Junior' AND rsum <= (SELECT 70000 - IFNULL(MAX(rsum), 0) FROM CTE WHERE experience = 'Senior' AND rsum<=70000) 
+
+

friendrequest2.sql

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+# Write your MySQL query statement below
+WITH CTE AS(SELECT accepter_id        
+FROM 
+    RequestAccepted
+UNION ALL
+SELECT requester_id        
+FROM 
+    RequestAccepted    
+),
+counter_table AS (
+    SELECT accepter_id as id,
+    COUNT(accepter_id) as num
+    FROM CTE
+    GROUP BY accepter_id
+    )
+
+ SELECT id, num 
+ FROM counter_table
+ ORDER BY num DESC
+ LIMIT 1;