Last updated on October 10th, 2024 at 12:25 am

This Leetcode problem Customers Who Bought All Products LeetCode Solution is done in SQL.

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Customers Who Bought All Products LeetCode Solution

Problem Statement

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

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:

Output:

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

1. Customers Who Bought All Products LeetCode Solution MySQL

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