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+---
+comments: true
+difficulty: 中等
+edit_url: https://github.com/doocs/leetcode/edit/main/solution/3600-3699/3601.Find%20Drivers%20with%20Improved%20Fuel%20Efficiency/README.md
+tags:
+ - 数据库
+---
+
+
+
+# [3601. Find Drivers with Improved Fuel Efficiency](https://leetcode.cn/problems/find-drivers-with-improved-fuel-efficiency)
+
+[English Version](/solution/3600-3699/3601.Find%20Drivers%20with%20Improved%20Fuel%20Efficiency/README_EN.md)
+
+## 题目描述
+
+
+
+Table: drivers
+
+
++-------------+---------+
+| Column Name | Type |
++-------------+---------+
+| driver_id | int |
+| driver_name | varchar |
++-------------+---------+
+driver_id is the unique identifier for this table.
+Each row contains information about a driver.
+
+
+Table: trips
+
+
++---------------+---------+
+| Column Name | Type |
++---------------+---------+
+| trip_id | int |
+| driver_id | int |
+| trip_date | date |
+| distance_km | decimal |
+| fuel_consumed | decimal |
++---------------+---------+
+trip_id is the unique identifier for this table.
+Each row represents a trip made by a driver, including the distance traveled and fuel consumed for that trip.
+
+
+Write a solution to find drivers whose fuel efficiency has improved by comparing their average fuel efficiency in the first half of the year with the second half of the year.
+
+
+ - Calculate fuel efficiency as
distance_km / fuel_consumed for each trip
+ - First half: January to June, Second half: July to December
+ - Only include drivers who have trips in both halves of the year
+ - Calculate the efficiency improvement as (
second_half_avg - first_half_avg)
+ - Round all results to
2 decimal places
+
+
+Return the result table ordered by efficiency improvement in descending order, then by driver name in ascending order.
+
+The result format is in the following example.
+
+
+Example:
+
+
+
Input:
+
+
drivers table:
+
+
++-----------+---------------+
+| driver_id | driver_name |
++-----------+---------------+
+| 1 | Alice Johnson |
+| 2 | Bob Smith |
+| 3 | Carol Davis |
+| 4 | David Wilson |
+| 5 | Emma Brown |
++-----------+---------------+
+
+
+
trips table:
+
+
++---------+-----------+------------+-------------+---------------+
+| trip_id | driver_id | trip_date | distance_km | fuel_consumed |
++---------+-----------+------------+-------------+---------------+
+| 1 | 1 | 2023-02-15 | 120.5 | 10.2 |
+| 2 | 1 | 2023-03-20 | 200.0 | 16.5 |
+| 3 | 1 | 2023-08-10 | 150.0 | 11.0 |
+| 4 | 1 | 2023-09-25 | 180.0 | 12.5 |
+| 5 | 2 | 2023-01-10 | 100.0 | 9.0 |
+| 6 | 2 | 2023-04-15 | 250.0 | 22.0 |
+| 7 | 2 | 2023-10-05 | 200.0 | 15.0 |
+| 8 | 3 | 2023-03-12 | 80.0 | 8.5 |
+| 9 | 3 | 2023-05-18 | 90.0 | 9.2 |
+| 10 | 4 | 2023-07-22 | 160.0 | 12.8 |
+| 11 | 4 | 2023-11-30 | 140.0 | 11.0 |
+| 12 | 5 | 2023-02-28 | 110.0 | 11.5 |
++---------+-----------+------------+-------------+---------------+
+
+
+
Output:
+
+
++-----------+---------------+------------------+-------------------+------------------------+
+| driver_id | driver_name | first_half_avg | second_half_avg | efficiency_improvement |
++-----------+---------------+------------------+-------------------+------------------------+
+| 2 | Bob Smith | 11.24 | 13.33 | 2.10 |
+| 1 | Alice Johnson | 11.97 | 14.02 | 2.05 |
++-----------+---------------+------------------+-------------------+------------------------+
+
+
+
Explanation:
+
+
+ - Alice Johnson (driver_id = 1):
+
+
+ - First half trips (Jan-Jun): Feb 15 (120.5/10.2 = 11.81), Mar 20 (200.0/16.5 = 12.12)
+ - First half average efficiency: (11.81 + 12.12) / 2 = 11.97
+ - Second half trips (Jul-Dec): Aug 10 (150.0/11.0 = 13.64), Sep 25 (180.0/12.5 = 14.40)
+ - Second half average efficiency: (13.64 + 14.40) / 2 = 14.02
+ - Efficiency improvement: 14.02 - 11.97 = 2.05
+
+
+ - Bob Smith (driver_id = 2):
+
+ - First half trips: Jan 10 (100.0/9.0 = 11.11), Apr 15 (250.0/22.0 = 11.36)
+ - First half average efficiency: (11.11 + 11.36) / 2 = 11.24
+ - Second half trips: Oct 5 (200.0/15.0 = 13.33)
+ - Second half average efficiency: 13.33
+ - Efficiency improvement: 13.33 - 11.24 = 2.09
+
+
+ - Drivers not included:
+
+ - Carol Davis (driver_id = 3): Only has trips in first half (Mar, May)
+ - David Wilson (driver_id = 4): Only has trips in second half (Jul, Nov)
+ - Emma Brown (driver_id = 5): Only has trips in first half (Feb)
+
+
+
+
+
+
The output table is ordered by efficiency improvement in descending order then by name in ascending order.
+
Table: drivers
+
+
++-------------+---------+
+| Column Name | Type |
++-------------+---------+
+| driver_id | int |
+| driver_name | varchar |
++-------------+---------+
+driver_id is the unique identifier for this table.
+Each row contains information about a driver.
+
+
+Table: trips
+
+
++---------------+---------+
+| Column Name | Type |
++---------------+---------+
+| trip_id | int |
+| driver_id | int |
+| trip_date | date |
+| distance_km | decimal |
+| fuel_consumed | decimal |
++---------------+---------+
+trip_id is the unique identifier for this table.
+Each row represents a trip made by a driver, including the distance traveled and fuel consumed for that trip.
+
+
+Write a solution to find drivers whose fuel efficiency has improved by comparing their average fuel efficiency in the first half of the year with the second half of the year.
+
+
+ - Calculate fuel efficiency as
distance_km / fuel_consumed for each trip
+ - First half: January to June, Second half: July to December
+ - Only include drivers who have trips in both halves of the year
+ - Calculate the efficiency improvement as (
second_half_avg - first_half_avg)
+ - Round all results to
2 decimal places
+
+
+Return the result table ordered by efficiency improvement in descending order, then by driver name in ascending order.
+
+The result format is in the following example.
+
+
+Example:
+
+
+
Input:
+
+
drivers table:
+
+
++-----------+---------------+
+| driver_id | driver_name |
++-----------+---------------+
+| 1 | Alice Johnson |
+| 2 | Bob Smith |
+| 3 | Carol Davis |
+| 4 | David Wilson |
+| 5 | Emma Brown |
++-----------+---------------+
+
+
+
trips table:
+
+
++---------+-----------+------------+-------------+---------------+
+| trip_id | driver_id | trip_date | distance_km | fuel_consumed |
++---------+-----------+------------+-------------+---------------+
+| 1 | 1 | 2023-02-15 | 120.5 | 10.2 |
+| 2 | 1 | 2023-03-20 | 200.0 | 16.5 |
+| 3 | 1 | 2023-08-10 | 150.0 | 11.0 |
+| 4 | 1 | 2023-09-25 | 180.0 | 12.5 |
+| 5 | 2 | 2023-01-10 | 100.0 | 9.0 |
+| 6 | 2 | 2023-04-15 | 250.0 | 22.0 |
+| 7 | 2 | 2023-10-05 | 200.0 | 15.0 |
+| 8 | 3 | 2023-03-12 | 80.0 | 8.5 |
+| 9 | 3 | 2023-05-18 | 90.0 | 9.2 |
+| 10 | 4 | 2023-07-22 | 160.0 | 12.8 |
+| 11 | 4 | 2023-11-30 | 140.0 | 11.0 |
+| 12 | 5 | 2023-02-28 | 110.0 | 11.5 |
++---------+-----------+------------+-------------+---------------+
+
+
+
Output:
+
+
++-----------+---------------+------------------+-------------------+------------------------+
+| driver_id | driver_name | first_half_avg | second_half_avg | efficiency_improvement |
++-----------+---------------+------------------+-------------------+------------------------+
+| 2 | Bob Smith | 11.24 | 13.33 | 2.10 |
+| 1 | Alice Johnson | 11.97 | 14.02 | 2.05 |
++-----------+---------------+------------------+-------------------+------------------------+
+
+
+
Explanation:
+
+
+ - Alice Johnson (driver_id = 1):
+
+
+ - First half trips (Jan-Jun): Feb 15 (120.5/10.2 = 11.81), Mar 20 (200.0/16.5 = 12.12)
+ - First half average efficiency: (11.81 + 12.12) / 2 = 11.97
+ - Second half trips (Jul-Dec): Aug 10 (150.0/11.0 = 13.64), Sep 25 (180.0/12.5 = 14.40)
+ - Second half average efficiency: (13.64 + 14.40) / 2 = 14.02
+ - Efficiency improvement: 14.02 - 11.97 = 2.05
+
+
+ - Bob Smith (driver_id = 2):
+
+ - First half trips: Jan 10 (100.0/9.0 = 11.11), Apr 15 (250.0/22.0 = 11.36)
+ - First half average efficiency: (11.11 + 11.36) / 2 = 11.24
+ - Second half trips: Oct 5 (200.0/15.0 = 13.33)
+ - Second half average efficiency: 13.33
+ - Efficiency improvement: 13.33 - 11.24 = 2.09
+
+
+ - Drivers not included:
+
+ - Carol Davis (driver_id = 3): Only has trips in first half (Mar, May)
+ - David Wilson (driver_id = 4): Only has trips in second half (Jul, Nov)
+ - Emma Brown (driver_id = 5): Only has trips in first half (Feb)
+
+
+
+
+
+
The output table is ordered by efficiency improvement in descending order then by name in ascending order.
+