diff --git a/Sql4_Q1_SrJr_Union.sql b/Sql4_Q1_SrJr_Union.sql
new file mode 100644
index 0000000..c879f8b
--- /dev/null
+++ b/Sql4_Q1_SrJr_Union.sql
@@ -0,0 +1,21 @@
+with cte as (
+select 
+    employee_id
+    , experience
+    , salary
+    , row_number() over(partition by experience order by salary) as rownum
+    , sum(salary) over(partition by experience order by salary, employee_id) as cumsum
+from Candidates
+)
+select 
+    'Senior' as experience
+    , coalesce(count(employee_id),0) as accepted_candidates
+from cte
+where experience = 'Senior' and cumsum <= 70000
+union
+select 
+    'Junior' as experience
+    , coalesce(count(employee_id),0) as accepted_candidates
+from cte
+where experience = 'Junior' and cumsum <= (select 70000 - coalesce(max(cumsum),0) from cte where experience = 'Senior'
+and cumsum <= 70000)
\ No newline at end of file
diff --git a/Sql4_Q2_LeagueStats.sql b/Sql4_Q2_LeagueStats.sql
new file mode 100644
index 0000000..ee7893b
--- /dev/null
+++ b/Sql4_Q2_LeagueStats.sql
@@ -0,0 +1,29 @@
+with home_away_master as 
+(
+    select 
+        home_team_id as team_id
+        , home_team_goals as for_goals
+        , away_team_goals as against_goals
+    from 
+        Matches
+    union all
+    select 
+        away_team_id as team_id
+        , away_team_goals as for_goals
+        , home_team_goals as against_goals
+    from 
+        Matches
+)
+select
+    t.team_name
+    , count(h.team_id) as matches_played
+    , sum(case when h.for_goals > h.against_goals then 3
+        when h.for_goals = h.against_goals then 1
+        else 0 end) as points
+    , sum(h.for_goals) as goal_for
+    , sum(h.against_goals) as goal_against
+    , sum(h.for_goals - h.against_goals) as goal_diff
+from 
+    Teams t join home_away_master h on t.team_id = h.team_id
+group by h.team_id
+order by 3 desc, 6 desc, 1
diff --git a/Sql4_Q3_SalesPerson.sql b/Sql4_Q3_SalesPerson.sql
new file mode 100644
index 0000000..90bc0d8
--- /dev/null
+++ b/Sql4_Q3_SalesPerson.sql
@@ -0,0 +1,13 @@
+with RED_sales_id as
+(
+    select
+        o.sales_id
+    from 
+        Orders o join Company c on c.com_id = o.com_id
+    where c.name = 'RED'
+)
+select 
+    s.name as name 
+from 
+    SalesPerson s
+where s.sales_id not in (select distinct sales_id from RED_sales_id)
\ No newline at end of file
diff --git a/Sql4_Q4_FriendReq_LIMIT.sql b/Sql4_Q4_FriendReq_LIMIT.sql
new file mode 100644
index 0000000..5bd38b8
--- /dev/null
+++ b/Sql4_Q4_FriendReq_LIMIT.sql
@@ -0,0 +1,18 @@
+with acceptor_sender_master as
+(
+    select 
+        requester_id as id
+    from RequestAccepted
+    union all
+    select 
+        accepter_id as id
+    from RequestAccepted
+)
+select 
+    id 
+    , count(id) as num
+from 
+    acceptor_sender_master
+group by 1
+order by 2 desc
+limit 1
\ No newline at end of file
diff --git a/Sql4_Q4_FriendReq_MAX.sql b/Sql4_Q4_FriendReq_MAX.sql
new file mode 100644
index 0000000..cc28e47
--- /dev/null
+++ b/Sql4_Q4_FriendReq_MAX.sql
@@ -0,0 +1,25 @@
+with acceptor_sender_master as
+(
+    select 
+        requester_id as id
+    from RequestAccepted
+    union all
+    select 
+        accepter_id as id
+    from RequestAccepted
+)
+, count_table as
+(
+select 
+    id 
+    , count(id) as num
+from 
+    acceptor_sender_master
+group by 1
+)
+select 
+    id
+    , num
+from 
+    count_table
+where num = (select max(num) from count_table)
\ No newline at end of file
diff --git a/Sql4_Q4_FriendReq_Window.sql b/Sql4_Q4_FriendReq_Window.sql
new file mode 100644
index 0000000..524083a
--- /dev/null
+++ b/Sql4_Q4_FriendReq_Window.sql
@@ -0,0 +1,17 @@
+with acceptor_sender_master as
+(
+    select 
+        requester_id as id
+    from RequestAccepted
+    union all
+    select 
+        accepter_id as id
+    from RequestAccepted
+)
+select 
+    distinct id 
+    , count(id) over(partition by id) as num
+from 
+    acceptor_sender_master
+order by 2 desc
+limit 1
\ No newline at end of file