Completed Sql1

Sql_Solutions/Problem1.sql

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+# Write your MySQL query statement below
+select name, population, area from world 
+where area>= 3000000 or population>= 25000000;

Sql_Solutions/Problem3.sql

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+# Write your MySQL query statement below
+DELETE p1 from person p1 JOIN person p2 
+on p1.email=p2. email and p1.id > p2.id;

Sql_Solutions/problem2.sql

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+CREATE FUNCTION getNthHighestSalary(N INT) RETURNS INT
+BEGIN
+  RETURN (
+      # Write your MySQL query statement below.
+    select DISTINCT salary from
+    (select salary, dense_rank() OVER (ORDER BY salary DESC) as Ranking from employee) as ranked_salary
+    WHERE Ranking = N
+  );
+END