Create calculate-parking-fees-and-duration.sql

Author: kamyu104

MySQL/calculate-parking-fees-and-duration.sql

@@ -0,0 +1,37 @@
+# Time:  O(nlogn)
+# Space: O(n)
+
+WITH info_cte AS (
+    SELECT car_id,
+           lot_id,
+           SUM(TIMESTAMPDIFF(SECOND, entry_time, exit_time)) AS duration
+    FROM ParkingTransactions
+    GROUP BY 1, 2
+    ORDER BY NULL
+), max_info_cte AS (
+    SELECT car_id,
+           MAX(duration) AS max_duration
+    FROM info_cte
+    GROUP BY 1
+    ORDER BY NULL
+), max_duration_lot_cte AS (
+    SELECT a.car_id,
+           lot_id AS most_time_lot
+    FROM info_cte a INNER JOIN max_info_cte b
+    ON a.car_id = b.car_id AND a.duration = b.max_duration
+), total_cte AS (
+    SELECT car_id,
+           SUM(fee_paid) AS total_fee_paid,
+           SUM(TIMESTAMPDIFF(SECOND, entry_time, exit_time)) AS total_duration
+    FROM ParkingTransactions
+    GROUP BY 1
+    ORDER BY NULL
+)
+
+SELECT a.car_id,
+       total_fee_paid,
+       ROUND(total_fee_paid * 3600 / total_duration, 2) AS avg_hourly_fee,
+       most_time_lot
+FROM max_duration_lot_cte a INNER JOIN total_cte b   
+ON a.car_id = b.car_id
+ORDER BY 1;