diff --git a/Q1_Solution.sql b/Q1_Solution.sql
new file mode 100644
index 0000000..d5eb053
--- /dev/null
+++ b/Q1_Solution.sql
@@ -0,0 +1,7 @@
+select 
+    name
+    , population
+    , area
+from 
+    World
+where (area >= 3000000) or (population >= 25000000)
\ No newline at end of file
diff --git a/Q1_Solution_UsingDECLARE_SET b/Q1_Solution_UsingDECLARE_SET
new file mode 100644
index 0000000..06c69a4
--- /dev/null
+++ b/Q1_Solution_UsingDECLARE_SET
@@ -0,0 +1,14 @@
+CREATE FUNCTION GetNthHighestSalary(N INT) RETURNS INT
+BEGIN
+    DECLARE M INT 
+    SET M = N-1
+    RETURN 
+    (
+        select 
+            distinct salary
+        from 
+            Employee
+        order by desc
+        limit M, 1
+    );
+    END
\ No newline at end of file
diff --git a/Q3_Sql1_solution.sql b/Q3_Sql1_solution.sql
new file mode 100644
index 0000000..b7be626
--- /dev/null
+++ b/Q3_Sql1_solution.sql
@@ -0,0 +1,12 @@
+with ranked_emails as 
+(
+    select 
+        id
+        , email
+        , row_number() over(partition by email order by id) as rnk
+    from 
+        Person
+)
+delete 
+from person p
+where p.id in (select ranked_emails.id from ranked_emails where rnk > 1)
\ No newline at end of file
diff --git a/SQL1_Q2_Question.sql b/SQL1_Q2_Question.sql
new file mode 100644
index 0000000..c3f66d0
--- /dev/null
+++ b/SQL1_Q2_Question.sql
@@ -0,0 +1,12 @@
+CREATE FUNCTION getNthHighestSalary(N INT) RETURNS INT
+BEGIN
+  RETURN (
+with cte as (
+    select 
+        *
+        , dense_rank() over(order by salary desc) as rnk
+    from Employee 
+)
+select distinct ifnull(salary, null) from cte where rnk = N
+);
+END
\ No newline at end of file
diff --git a/sql1_q3_crossjoin b/sql1_q3_crossjoin
new file mode 100644
index 0000000..5ddc97b
--- /dev/null
+++ b/sql1_q3_crossjoin
@@ -0,0 +1,4 @@
+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