Last updated on January 22nd, 2025 at 11:21 pm
Here, we see the Customer Placing the Largest Number of Orders LeetCode Solution. This Leetcode problem is solved using MySQL and Pandas.
List of all LeetCode Solution
Level of Question
Easy

Customer Placing the Largest Number of Orders LeetCode Solution
Table of Contents
1. Problem Statement
Column Name | Type |
order_number | int |
customer_number | int |
Orders
order_number is the primary key (column with unique values) for this table. This table contains information about the order ID and the customer ID.
Write a solution to find the customer_number
for the customer who has placed the largest number of orders.
The test cases are generated so that exactly one customer will have placed more orders than any other customer.
The result format is in the following example.
Example 1:
Input:
order_number | customer_number |
1 | 1 |
2 | 2 |
3 | 3 |
4 | 3 |
Output:
customer_number |
3 |
Explanation: The customer with number 3 has two orders, which is greater than either customer 1 or 2 because each of them only has one order. So the result is customer_number 3.
2. Code Implementation in Different Languages
2.1 Customer Placing the Largest Number of Orders MySQL
select customer_number from ( select customer_number, count(*) as cnt from orders group by customer_number ) as e order by e.cnt desc limit 1;