diff --git a/1.sql b/1.sql
new file mode 100644
index 0000000..c29865e
--- /dev/null
+++ b/1.sql
@@ -0,0 +1,12 @@
+# Write your MySQL query statement below
+with cte as (
+    select employee_id, experience, sum(salary) over (partition by experience order by salary, employee_id) as ru_sum
+    from Candidates
+)
+Select 'Senior' as experience, count(employee_id) as accepted_candidates 
+from cte where experience ='senior' and ru_sum<=70000
+union
+Select 'Junior' as experience, count(employee_id) as accepted_candidates 
+from cte where experience ='junior' and ru_sum<=(
+Select 70000 - ifnull(max(ru_sum),0)
+from cte where experience ='senior' and ru_sum<=70000)
\ No newline at end of file
diff --git a/2.sql b/2.sql
new file mode 100644
index 0000000..a688b0b
--- /dev/null
+++ b/2.sql
@@ -0,0 +1,26 @@
+# Write your MySQL query statement below
+with cte as 
+(
+select home_team_id as t, home_team_goals as goal, away_team_goals as away,
+case
+when home_team_goals > away_team_goals then 3
+when home_team_goals < away_team_goals then 0
+else 1
+end as points
+from Matches
+union all
+select away_team_id as t, away_team_goals as goal, home_team_goals as away,
+case
+when away_team_goals > home_team_goals then 3
+when away_team_goals < home_team_goals then 0
+else 1
+end as points
+from Matches
+)
+select t1.team_name, count(t1.team_id) as matches_played, sum(cte.points) as points,
+sum(cte.goal) goal_for,sum(cte.away)goal_against, sum(cte.goal) - sum(cte.away) as goal_diff
+from Teams t1
+Join cte
+on t1.team_id = cte.t
+group by t1.team_id
+order by points desc, goal_diff desc, team_name
\ No newline at end of file
diff --git a/3.sql b/3.sql
new file mode 100644
index 0000000..f328ca7
--- /dev/null
+++ b/3.sql
@@ -0,0 +1,12 @@
+# Write your MySQL query statement below
+with cte as (Select s.sales_id, o.order_id, s.name, o.com_id from SalesPerson s
+left join Orders o
+on o.sales_id = s.sales_id)
+select name 
+from SalesPerson
+where name not in (
+    select cte.name from cte 
+left join Company c 
+on cte.com_id=c.com_id
+where c.name ='RED'
+)
\ No newline at end of file
diff --git a/4.sql b/4.sql
new file mode 100644
index 0000000..8f4c588
--- /dev/null
+++ b/4.sql
@@ -0,0 +1,12 @@
+with cte as (select requester_id as r1
+from RequestAccepted
+union all
+select accepter_id as r1
+from RequestAccepted
+)
+
+select r1 as id, count(r1) as num
+from cte
+group by r1
+order by num desc
+limit 1
\ No newline at end of file