From 1a787346214894b4879bafcfc754a32136bb875e Mon Sep 17 00:00:00 2001
From: Pranathi <pdeepak1@toromail.csudh.edu>
Date: Tue, 10 Jun 2025 12:07:01 -0700
Subject: [PATCH] SQL5 Submitted

---
 Problem1.sql | 10 ++++++++++
 Problem2.sql | 12 ++++++++++++
 Problem3.sql | 19 +++++++++++++++++++
 Problem4.sql |  2 ++
 4 files changed, 43 insertions(+)
 create mode 100644 Problem1.sql
 create mode 100644 Problem2.sql
 create mode 100644 Problem3.sql
 create mode 100644 Problem4.sql

diff --git a/Problem1.sql b/Problem1.sql
new file mode 100644
index 0000000..47bfa22
--- /dev/null
+++ b/Problem1.sql
@@ -0,0 +1,10 @@
+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;
\ No newline at end of file
diff --git a/Problem2.sql b/Problem2.sql
new file mode 100644
index 0000000..6c30f87
--- /dev/null
+++ b/Problem2.sql
@@ -0,0 +1,12 @@
+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;
\ No newline at end of file
diff --git a/Problem3.sql b/Problem3.sql
new file mode 100644
index 0000000..72bdcc2
--- /dev/null
+++ b/Problem3.sql
@@ -0,0 +1,19 @@
+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 'deptavg' 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 deptavg>companyavg THEN 'higher'
+        WHEN deptavg<companyavg THEN 'lower'
+        ELSE 'same'
+    END
+) as 'comparison' from companyAvg JOIN deptAvg ON
+deptAvg.pay_month = companyAvg.pay_month
\ No newline at end of file
diff --git a/Problem4.sql b/Problem4.sql
new file mode 100644
index 0000000..33578ba
--- /dev/null
+++ b/Problem4.sql
@@ -0,0 +1,2 @@
+WITH CTE AS(SELECT player_id, event_date as 'first_login', RANK() OVER (PARTITION BY player_id order by event_date) as 'rnk' from activity)
+Select player_id, first_login from CTE where rnk = 1
\ No newline at end of file