diff --git a/BigCountries.sql b/BigCountries.sql
new file mode 100644
index 0000000..9884c1d
--- /dev/null
+++ b/BigCountries.sql
@@ -0,0 +1,4 @@
+# Write your MySQL query statement below
+Select name , population , area  
+FROM World
+WHERE area >= 3000000 OR population >= 25000000;
\ No newline at end of file
diff --git a/DeleteDuplicateEmails.sql b/DeleteDuplicateEmails.sql
new file mode 100644
index 0000000..d825869
--- /dev/null
+++ b/DeleteDuplicateEmails.sql
@@ -0,0 +1,2 @@
+# Write your MySQL query statement below
+DELETE p1 from person p1 JOIN person p2 where p1.email = p2.email and p1.id > p2.id;
\ No newline at end of file
diff --git a/nthHighestSalary.sql b/nthHighestSalary.sql
new file mode 100644
index 0000000..181661f
--- /dev/null
+++ b/nthHighestSalary.sql
@@ -0,0 +1,9 @@
+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