Completed Sql4

Friend Requests II.sql

@@ -0,0 +1,9 @@
+WITH CTE AS(
+SELECT requester_id AS 'id' FROM RequestAccepted
+UNION ALL
+SELECT accepter_id AS 'id' FROM RequestAccepted
+),
+ACTE AS(
+    SELECT id, COUNT(id) AS 'num' FROM CTE GROUP BY id
+)
+SELECT id, num FROM ACTE WHERE num = (SELECT MAX(num) FROM ACTE)

League Statistics.sql

@@ -0,0 +1,13 @@
+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 away_team_id AS 'r1', home_team_id AS 'r2', away_team_goals AS 'g1', home_team_goals AS 'g2' FROM Matches
+)
+#SELECT * FROM CTE;
+SELECT 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

Sales Person.sql

@@ -0,0 +1,3 @@
+SELECT name FROM SalesPerson s WHERE sales_id NOT IN(
+    SELECT o.sales_id FROM Orders o JOIN Company c ON o.com_id = c.com_id WHERE c.name = 'Red'
+)

The Number of Seniors and Juniors to Join the Company.sql

@@ -0,0 +1,7 @@
+WITH CTE AS(
+SELECT *, SUM(salary) OVER (PARTITION BY experience ORDER BY salary, employee_id) as 'rsum' FROM Candidates
+)
+# SELECT * FROM CTE
+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)