SQL 4 Done

FriendRequests2.sql

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+# Write your MySQL query statement below
+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;

LeagueStatistics.sql

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+WITH
+    Scores AS (
+        SELECT
+            home_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 score,
+            home_team_goals AS goals,
+            away_team_goals AS away_goals
+        FROM Matches
+        UNION ALL
+        SELECT
+            away_team_id AS team_id,
+            CASE
+                WHEN home_team_goals > away_team_goals THEN 0
+                WHEN home_team_goals < away_team_goals THEN 3
+                ELSE 1
+            END AS score,
+            away_team_goals AS goals,
+            home_team_goals AS away_goals
+        FROM Matches
+    )
+SELECT
+    team_name,
+    COUNT(1) AS matches_played,
+    SUM(score) AS points,
+    SUM(goals) AS goal_for,
+    SUM(away_goals) AS goal_against,
+    (SUM(goals) - SUM(away_goals)) AS goal_diff
+FROM
+    Scores AS s
+    JOIN Teams AS t ON s.team_id = t.team_id
+GROUP BY s.team_id
+ORDER BY points DESC, goal_diff DESC, team_name;

NumberofSeniors.sql

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+with s as (
+    select
+        employee_id,
+        sum(salary) over(
+            order by
+                salary
+        ) cur
+    from
+        Candidates
+    where
+        experience = 'Senior'
+),
+j as (
+    select
+        employee_id,
+        ifnull(
+            (
+                select
+                    max(cur)
+                from
+                    s
+                where
+                    cur <= 70000
+            ),
+            0
+        ) + sum(salary) over(
+            order by
+                salary
+        ) cur
+    from
+        Candidates
+    where
+        experience = 'Junior'
+)
+select
+    'Senior' experience,
+    count(employee_id) accepted_candidates
+from
+    s
+where
+    cur <= 70000
+union
+all
+select
+    'Junior' experience,
+    count(employee_id) accepted_candidates
+from
+    j
+where
+    cur <= 70000;

SalesPerson.sql

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+SELECT name FROM salesperson 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');