From 08afc941c9173b824498044e2347fe781bbf73c3 Mon Sep 17 00:00:00 2001
From: Sai Krishna Teja Adarsh Nadella <nskt1494@gmail.com>
Date: Wed, 21 May 2025 21:56:55 -0700
Subject: [PATCH] SQL1 Done

---
 Nth-Highest-Salary.sql      | 10 ++++++++++
 bigcountries.sql            |  2 ++
 delete-duplicate-emails.sql |  2 ++
 3 files changed, 14 insertions(+)
 create mode 100644 Nth-Highest-Salary.sql
 create mode 100644 bigcountries.sql
 create mode 100644 delete-duplicate-emails.sql

diff --git a/Nth-Highest-Salary.sql b/Nth-Highest-Salary.sql
new file mode 100644
index 0000000..96c2baa
--- /dev/null
+++ b/Nth-Highest-Salary.sql
@@ -0,0 +1,10 @@
+CREATE FUNCTION getNthHighestSalary(N INT) RETURNS INT
+BEGIN
+  RETURN (
+      # Write your MySQL query statement below.
+      WITH CTE AS (
+        SELECT *,DENSE_RANK() OVER(ORDER BY Salary DESC) AS rnk FROM employee
+      )
+      SELECT DISTINCT IFNULL(salary,NULL) FROM CTE WHERE rnk=N
+  );
+END
\ No newline at end of file
diff --git a/bigcountries.sql b/bigcountries.sql
new file mode 100644
index 0000000..4c24f21
--- /dev/null
+++ b/bigcountries.sql
@@ -0,0 +1,2 @@
+# Write your MySQL query statement below
+select name,population, area from world where area>=3000000 or population>=25000000;
\ No newline at end of file
diff --git a/delete-duplicate-emails.sql b/delete-duplicate-emails.sql
new file mode 100644
index 0000000..8843f73
--- /dev/null
+++ b/delete-duplicate-emails.sql
@@ -0,0 +1,2 @@
+# Write your MySQL query statement below
+DELETE FROM PERSON WHERE ID NOT IN (SELECT * FROM (SELECT MIN(ID) FROM PERSON GROUP BY EMAIL) AS EMAIL);
\ No newline at end of file