SQL1 Completed

Problem1.sql

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+SELECT name, population, area from World where area>= 3000000 or population>=25000000

Problem2.sql

@@ -0,0 +1,12 @@
+
+CREATE FUNCTION getNthHighestSalary(N INT) RETURNS INT
+BEGIN
+  DECLARE M INT;
+  SET M=N-1;
+  RETURN (
+        select distinct salary
+        from employee
+        order by salary desc
+        limit M,1
+  );
+END

Problem3.sql

@@ -0,0 +1,4 @@
+DELETE p1 from PERSON p1
+JOIN PERSON p2
+ON p1.email = p2.email 
+AND p1.id>p2.id