sql 3

2.sql

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+with cte as (
+select p.passenger_id, min(b.arrival_time) as atime from Passengers  p
+left join buses b on p.arrival_time<= b.arrival_time
+group by p.passenger_id)
+
+select bus_id, ifnull(count(cte.passenger_id),0)as passengers_cnt from Buses b1
+left join cte on b1.arrival_time = cte.atime
+group by bus_id
+order by bus_id

3.sql

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+SELECT 
+    activity_date AS day, 
+    COUNT(DISTINCT user_id) AS active_users
+FROM 
+    Activity
+WHERE 
+activity_date BETWEEN '2019-06-28' AND '2019-07-27'
+group by 1

sql1.sql

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+select distinct l1.num as ConsecutiveNums 
+from Logs l1,Logs l2,Logs l3
+where l1.id=l2.id-1 and l2.id=l3.id-1
+and l1.num=l2.num and l2.num=l3.num