SQL4

Problem 1.sql

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+# Write your MySQL query statement below
+WITH AllCandidates AS (
+    SELECT experience, employee_id,  SUM(salary) OVER (PARTITION BY experience ORDER BY salary, experience ) AS CusumSalary, salary FROM Candidates
+)
+SElECT 'Senior' AS experience, COUNT(employee_id) AS accepted_candidates FROM AllCandidates WHERE CusumSalary <=70000 AND experience ='Senior'
+UNION ALL
+SElECT 'Junior' AS experience, COUNT(employee_id) AS accepted_candidates FROM AllCandidates WHERE experience ='Junior' AND
+CusumSalary<= (SELECT 70000 -IFNULL(MAX(CusumSalary),0) FROM AllCandidates WHERE CusumSalary <=70000 AND experience ='Senior')
+

Problem 2 LeagueStats.sql

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+# Write your MySQL query statement below
+-- Step 1: Calculate points, goals scored, and goal difference for home teams
+WITH HomeTeam AS (
+    SELECT 
+        home_team_id AS team_id,
+        CASE 
+            WHEN home_team_goals > away_team_goals THEN 3 -- 3 points for a win
+            WHEN home_team_goals < away_team_goals THEN 0 -- 0 points for a loss
+            ELSE 1 -- 1 point for a draw
+        END AS points,
+        home_team_goals AS goal_for,
+        away_team_goals AS goal_against,
+        home_team_goals - away_team_goals AS goal_diff
+    FROM Matches
+),
+
+-- Step 2: Calculate the same metrics for away teams
+AwayTeam AS (
+    SELECT 
+        away_team_id AS team_id,
+        CASE 
+            WHEN home_team_goals < away_team_goals THEN 3
+            WHEN home_team_goals > away_team_goals THEN 0
+            ELSE 1
+        END AS points,
+        away_team_goals AS goal_for,
+        home_team_goals AS goal_against,
+        away_team_goals - home_team_goals AS goal_diff
+    FROM Matches
+),
+
+-- Step 3: Combine home and away team results into a single dataset
+FinalUnion AS (
+    SELECT * FROM HomeTeam
+    UNION ALL
+    SELECT * FROM AwayTeam
+)
+
+-- Step 4: Aggregate team statistics and rank teams
+SELECT 
+    t.team_name, 
+    COUNT(FinalUnion.team_id) AS matches_played, -- Total matches played by each team
+    SUM(points) AS points, -- Total points earned by each team
+    SUM(goal_for) AS goal_for, -- Total goals scored
+    SUM(goal_against) AS goal_against, -- Total goals conceded
+    SUM(goal_diff) AS goal_diff -- Total goal difference
+FROM FinalUnion
+LEFT JOIN teams t
+ON FinalUnion.team_id = t.team_id
+GROUP BY t.team_name
+ORDER BY points DESC, goal_diff DESC, t.team_name; -- Rank by points, then goal difference

Problem 3SalesPerson.sql

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+-- Getting sales persons details who is associated with company Red
+WITH CTE AS (
+            SELECT o.order_id, o. sales_id, o.com_id, c.name as Companyname FROM Orders o
+            LEFT JOIN Company c
+            ON o.com_id = c.com_id
+            WHERE c.name = 'RED'
+
+)
+ --  Get sales names who are not associated with Red
+SELECT name FROM SalesPerson 
+WHERE sales_id NOT IN (SELECT sales_id FROM CTE)

Problem 4FriendRequests.sql

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+WITH UnionOutput AS (
+    SELECT requester_id AS person, accepter_id AS friend FROM RequestAccepted
+    UNION ALL
+    SELECT accepter_id AS person, requester_id AS friend FROM RequestAccepted
+)
+SELECT 
+    person AS id, 
+    COUNT(friend) AS num
+FROM UnionOutput
+GROUP BY person
+ORDER BY num DESC
+LIMIT 1;