Watch 10 video solutions for Customers Who Bought All Products, a medium level problem involving Database. This walkthrough by Learn With Chirag has 4,428 views views. Want to try solving it yourself? Practice on FleetCode or read the detailed text solution.
Table: Customer
+-------------+---------+ | Column Name | Type | +-------------+---------+ | customer_id | int | | product_key | int | +-------------+---------+ This table may contain duplicates rows.customer_idis not NULL.product_key is a foreign key (reference column) toProducttable.
Table: Product
+-------------+---------+ | 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 table: +-------------+-------------+ | customer_id | product_key | +-------------+-------------+ | 1 | 5 | | 2 | 6 | | 3 | 5 | | 3 | 6 | | 1 | 6 | +-------------+-------------+ Product table: +-------------+ | 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.
