Finished Sql3

ConsecutiveNumbers.sql

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+# Write your MySQL query statement below
+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;

Numberofpassengers.sql

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+SELECT
+    bus_id,
+    count(passenger_id) - lag(count(passenger_id), 1, 0) OVER (
+        ORDER BY b.arrival_time
+    ) AS passengers_cnt
+FROM
+    Buses AS b
+    LEFT JOIN Passengers AS p ON p.arrival_time <= b.arrival_time
+GROUP BY 1
+ORDER BY 1;

PivotProducts.sql

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+REATE PROCEDURE PivotProducts()
+BEGIN
+	# Write your MySQL query statement below.
+	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

useractivity.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 
+    activity_date