diff --git a/problem1-595-Big-countries.sql b/problem1-595-Big-countries.sql
new file mode 100644
index 0000000..4630923
--- /dev/null
+++ b/problem1-595-Big-countries.sql
@@ -0,0 +1,2 @@
+Select name,population,area from World
+where area >= 3000000 or population >= 25000000
\ No newline at end of file
diff --git a/problem2-177-nthhighest-salary.sql b/problem2-177-nthhighest-salary.sql
new file mode 100644
index 0000000..4a5b11c
--- /dev/null
+++ b/problem2-177-nthhighest-salary.sql
@@ -0,0 +1,14 @@
+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
\ No newline at end of file
diff --git a/problem3-196-delete-duplicate-emails.sql b/problem3-196-delete-duplicate-emails.sql
new file mode 100644
index 0000000..b4ddeb5
--- /dev/null
+++ b/problem3-196-delete-duplicate-emails.sql
@@ -0,0 +1,6 @@
+delete p1
+from
+person p1
+cross join person p2
+where p1.email = p2.email
+and p1.id > p2.id
\ No newline at end of file