Completed Sql5

Average Salary Department vs Company.sql

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+WITH companyAvg AS(
+    SELECT date_format(pay_date, '%Y-%m') AS 'pay_month', AVG(amount) AS 'company_avg' FROM salary GROUP BY pay_month
+),
+deptAvg AS(
+    SELECT date_format(pay_date, '%Y-%m') AS 'pay_month', department_id, AVG(amount) AS 'department_avg' FROM Salary JOIN Employee ON Salary.employee_id = employee.employee_id GROUP BY department_id, pay_month
+)
+SELECT deptAvg.pay_month, department_id, (
+    CASE
+        WHEN department_avg > company_avg THEN 'higher'
+        WHEN department_avg < company_avg THEN 'lower'
+        ELSE 'same'
+    END
+) AS 'comparison' FROM companyAvg JOIN deptAvg ON companyAvg.pay_month = deptAvg.pay_month

Game Play Analysis I.sql

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+SELECT player_id, MIN(event_date) AS 'first_login' FROM Activity GROUP BY player_id

Report Contiguos Dates.sql

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+WITH CTE AS (
+    SELECT fail_date AS 'dat', 'failed' AS period_state FROM Failed WHERE YEAR(fail_date) = 2019
+    UNION ALL
+    SELECT success_date AS 'dat', 'succeeded' AS period_state FROM Succeeded WHERE YEAR(success_date) = 2019
+),
+ACTE AS (
+    SELECT dat, period_state, ROW_NUMBER() OVER (ORDER BY dat) AS 'rn_overall', ROW_NUMBER() OVER (PARTITION BY period_state ORDER BY dat) AS 'rn_period' FROM CTE
+),
+ANCTE AS (
+    SELECT dat, period_state, rn_overall - rn_period AS 'group_key' FROM ACTE
+)
+SELECT period_state, MIN(dat) AS 'start_date', MAX(dat) AS 'end_date' FROM ANCTE GROUP BY period_state, group_key ORDER BY start_date

Student Report by Geography.sql

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+WITH first as(
+    SELECT name as 'America', ROW_NUMBER() OVER(ORDER BY name) AS 'rnk' From student WHERE continent = 'America'
+),
+second as(
+    SELECT name as 'Asia', ROW_NUMBER() OVER(ORDER BY name) AS 'rnk' From student WHERE continent = 'Asia'
+),
+third as(
+    SELECT name as 'Europe', ROW_NUMBER() OVER(ORDER BY name) AS 'rnk' From student WHERE continent = 'Europe'
+)
+
+SELECT America , Asia , Europe FROM second RIGHT JOIN first on first.rnk = second.rnk LEFT JOIN third 
+ON first.rnk = third.rnk;