Done SQL3

Problem1.sql

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+with cte as (
+
+   select num,
+
+   lead(num,1) over() num1,
+   lead(num,2) over() num2
+   from logs
+
+)
+
+select distinct num ConsecutiveNums from cte where (num=num1) and (num=num2)

Problem2.sql

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+WITH CTE AS (
+    SELECT p.passenger_id, MIN(b.arrival_time) AS btime
+    FROM passengers p
+    JOIN buses b ON p.arrival_time <= b.arrival_time
+    GROUP BY p.passenger_id
+)
+
+SELECT b.bus_id, COUNT(c.btime) AS 'passengers_cnt'
+FROM buses b
+LEFT JOIN CTE c ON b.arrival_time = c.btime
+GROUP BY b.bus_id
+ORDER BY b.bus_id;

Problem3.sql

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+select activity_date as 'day' , COUNT(DISTINCT user_id) AS 'active_users' from Activity
+WHERE activity_date >'2019-06-27' AND activity_date <='2019-07-27' Group by activity_date;