Completed Sql1

1.sql

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+SELECT name, population, area
+FROM World
+WHERE area >= 3000000 OR population >= 25000000

2.sql

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+CREATE FUNCTION getNthHighestSalary(N INT) RETURNS INT
+BEGIN
+DECLARE M INT;
+SET M = N-1;
+  RETURN (
+      # Write your MySQL query statement below.
+      SELECT DISTINCT salary 
+      FROM Employee
+      ORDER BY salary DESC
+      LIMIT M, 1
+
+  );
+END

3.sql

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+DELETE p1
+FROM Person p1
+JOIN Person p2
+WHERE p1.email = p2.email AND p1.id>p2.id