Last updated on October 9th, 2024 at 10:34 pm

This Leetcode problem Customer Placing the Largest Number of Orders LeetCode Solution is done in SQL.

List of all LeetCode Solution

Customer Placing the Largest Number of Orders LeetCode Solution

Problem Statement

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:

Output:

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.

1. Customer Placing the Largest Number of Orders LeetCode Solution 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;