Sql3 3 problems

Number_of_passengers_in_each_bus.SQL

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+# Write your MySQL query statement below
+with cte as(select p.passenger_id,p.arrival_time,min(b.arrival_time) as btime from passengers p
+inner join Buses b 
+where 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

User_Activity.SQL

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+# Write your MySQL query statement below
+# 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 1;
+# select activity_date as 'day', Count(Distinct user_id) As 'active_users'
+# from Activity where DATEDIFF('2019-07-27', activity_date) >= 0 AND DATEDIFF('2019-07-#27',activity_date) < 30
+# group by 1;
+select activity_date as 'day', Count(Distinct user_id) As 'active_users'
+from Activity where activity_date between DATE_SUB('2019-07-27', Interval 29 DAY) AND '2019-07-27'
+group by 1;

consecutive_numbers.SQL

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+# Write your MySQL query statement below
+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