diff --git a/Problem1.sql b/Problem1.sql
new file mode 100644
index 0000000..26b38b1
--- /dev/null
+++ b/Problem1.sql
@@ -0,0 +1 @@
+SELECT name, population, area from World where area>= 3000000 or population>=25000000
\ No newline at end of file
diff --git a/Problem2.sql b/Problem2.sql
new file mode 100644
index 0000000..2f2fc42
--- /dev/null
+++ b/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
diff --git a/Problem3.sql b/Problem3.sql
new file mode 100644
index 0000000..9dbb9d9
--- /dev/null
+++ b/Problem3.sql
@@ -0,0 +1,4 @@
+DELETE p1 from PERSON p1
+JOIN PERSON p2
+ON p1.email = p2.email 
+AND p1.id>p2.id
\ No newline at end of file