Completed Sql3

Consecutive Numbers.sql

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+SELECT DISTINCT l3.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;

Dynamic Pivoting of a Table.sql

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+CREATE PROCEDURE PivotProducts()
+BEGIN
+	# I was found this problem extremely challenging and was unable to find a video of this problem on the S30.
+
+   	SET group_concat_max_len = 5000;
+    SELECT GROUP_CONCAT(DISTINCT 'MAX(CASE WHEN store = \'',
+               store,
+               '\' THEN price ELSE NULL END) AS ',
+               store
+               ORDER BY store) INTO @sql
+    FROM Products;
+    SET @sql =  CONCAT('SELECT product_id, ',
+                    @sql,
+                    ' FROM Products GROUP BY product_id');
+    PREPARE stmt FROM @sql;
+    EXECUTE stmt;
+    DEALLOCATE PREPARE stmt;
+END

Number of Passengers in Each Bus.sql

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+WITH CTE AS(
+    SELECT p.passenger_id, p.arrival_time, MIN(b.arrival_time) AS 'btime' FROM Passengers p INNER JOIN Buses b ON p.arrival_time <= b.arrival_time GROUP BY p.passenger_id
+)
+# SELECT * FROM CTE
+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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+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