Completed Sql5

AverageSalaryDepartmentVsCompany.sql

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+'''
+3 Problem 3 : Average Salary Department vs Company (https://leetcode.com/problems/average-salary-departments-vs-company/description/ )
+'''
+
+WITH companyAvg AS (
+    SELECT date_format(pay_date, '%Y-%m') AS 'pay_month', AVG(amount) AS 'CompanyAvg' FROM Salary GROUP BY pay_month),
+deptAvg AS (
+    SELECT date_format(pay_date, '%Y-%m') AS 'pay_month', department_id, AVG(amount) AS 'departmentAvg' 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 departmentAvg > CompanyAvg THEN 'higher'
+        WHEN departmentAvg < CompanyAvg THEN 'lower'
+        ELSE 'same'
+    END    
+) AS 'comparison' FROM companyAvg JOIN deptAvg ON deptAvg.pay_month = companyAvg.pay_month

GamePlayAnalysisI.sql

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+'''
+4 Problem 4 : Game Play Analysis I (https://leetcode.com/problems/game-play-analysis-i/ )
+'''
+
+SELECT player_id, MIN(event_date) AS first_login
+FROM Activity
+GROUP BY player_id

ReportContiguosDates.sql

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+'''
+Sql5
+
+1 Problem 1 : Report Contiguos Dates (https://leetcode.com/problems/report-contiguous-dates/ )
+'''
+
+WITH CTE AS (
+    SELECT fail_date AS 'dat', 'failed' AS period_state, RANK() OVER(ORDER BY fail_date) AS 'rnk' FROM Failed WHERE YEAR(fail_date) = 2019
+    UNION ALL
+    SELECT success_date AS 'dat', 'succeeded' AS period_state, RANK() OVER(ORDER BY success_date) AS 'rnk' FROM Succeeded WHERE YEAR(success_date) = 2019
+)
+SELECT period_state, MIN(dat) AS start_date, MAX(dat) AS end_date FROM (SELECT * , RANK() OVER(ORDER BY dat) - rnk AS 'diff' FROM CTE) AS y GROUP BY diff, period_state ORDER BY start_date

StudentReportByGeography.sql

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+'''
+2 Problem 2 : Student Report By Geography (https://leetcode.com/problems/students-report-by-geography/ )
+'''
+
+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