SQL4 submitted

Problem1.sql

@@ -0,0 +1,6 @@
+WITH CTE AS (
+    SELECT employee_id, experience, salary, 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)

Problem2.sql

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+WITH CTE AS(
+    Select home_team_id as r1, away_team_id as r2, home_team_goals as g1, away_team_goals as g2 
+    from matches
+    UNION ALL
+    Select home_team_id as r2, away_team_id as r1, home_team_goals as g2, away_team_goals as g1
+    from matches  
+)
+Select t.team_name, Count(c.r1) as 'matches_played',
+SUM(
+    CASE
+        WHEN c.g1>c.g2 THEN 3
+        WHEN c.g1 = c.g2 THEN 1
+        ELSE 0
+    END
+) as points, SUM(c.g1) as 'goal_for', SUM(c.g2) as 'goal_against', SUM(c.g1) - SUM(c.g2) 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;

Problem3.sql

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+SELECT name from SalesPerson where sales_id NOT IN ( Select DISTINCT o.sales_id 
+From Orders o
+Join Company c ON o.com_id = c.com_id
+where c.name = 'RED')

Problem4.sql

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+WITH CTE AS(
+    Select requester_id as id from RequestAccepted
+UNION ALL
+Select accepter_id as id from RequestAccepted)
+Select id, count(id) as 'num' from CTE 
+group by id
+order by num desc
+LIMIT 1