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-# Sql1
-
-1. Problem 1: Big Countries (https://leetcode.com/problems/big-countries/)
-2. Problem 2: Nth Highest Salary (https://leetcode.com/problems/nth-highest-salary/)
-3. Problem 3: Delete Duplicate Emails (https://leetcode.com/problems/delete-duplicate-emails/)
diff --git a/sql_1.txt b/sql_1.txt
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+Q1:
+SELECT name, population, area FROM world WHERE area>=3000000 or population>=25000000
+
+Q2:
+CREATE FUNCTION getNthHighestSalary(N INT) RETURNS INT
+
+    RETURN (
+        WITH CTE AS(
+            SELECT *, DENSE_RANK()OVER(ORDER BY Salary DESC) as rankzz from employee
+        )
+        SELECT DISTINCT salary from CTE where rankzz=n
+    );
+
+Q3:
+DELETE p1 from person p1 CROSS JOIN person p2 where p1.email=p2.email and p1.id>p2.id