Last updated on January 22nd, 2025 at 11:20 pm

Here, we see the Customers Who Bought All Products LeetCode Solution. This Leetcode problem is solved using MySQL and Pandas.

List of all LeetCode Solution

Level of Question

Medium

Customers Who Bought All Products LeetCode Solution

1. Problem Statement

Column Name	Type
customer_id	int
product_key	int

This table may contain duplicates rows. customer_id is not NULL. product_key is a foreign key (reference column) to Product table.

Column Name	Type
product_key	int

product_key is the primary key (column with unique values) for this table.

Write a solution to report the customer ids from the Customer table that bought all the products in the Product table.

Return the result table in any order.

The result format is in the following example.

Example 1:
Input:

customer_id	product_key
1	5
2	6
3	5
3	6
1	6

product_key

5

6

Output:

customer_id

1

3

Explanation: The customers who bought all the products (5 and 6) are customers with IDs 1 and 3.

2. Code Implementation in Different Languages

2.1 Customers Who Bought All Products MySQL

select 
  customer_id 
from 
  Customer 
group by 
  customer_id 
having 
  sum(distinct product_key) = (
    select 
      sum(product_key) 
    from 
      Product
  );