# Customers Who Bought Products A And B But Not C Problem

## Description

LeetCode Problem 1398.

Table: Customers

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+---------------------+---------+
| Column Name         | Type    |
+---------------------+---------+
| customer_id         | int     |
| customer_name       | varchar |
+---------------------+---------+
customer_id is the primary key for this table.
customer_name is the name of the customer.
``````

Table: Orders

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+---------------+---------+
| Column Name   | Type    |
+---------------+---------+
| order_id      | int     |
| customer_id   | int     |
| product_name  | varchar |
+---------------+---------+
order_id is the primary key for this table.
customer_id is the id of the customer who bought the product "product_name".
``````

Write an SQL query to report the customer_id and customer_name of customers who bought products “A”, “B” but did not buy the product “C” since we want to recommend them buy this product.

Return the result table ordered by customer_id.

The query result format is in the following example.

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Customers table:
+-------------+---------------+
| customer_id | customer_name |
+-------------+---------------+
| 1           | Daniel        |
| 2           | Diana         |
| 3           | Elizabeth     |
| 4           | Jhon          |
+-------------+---------------+

Orders table:
+------------+--------------+---------------+
| order_id   | customer_id  | product_name  |
+------------+--------------+---------------+
| 10         |     1        |     A         |
| 20         |     1        |     B         |
| 30         |     1        |     D         |
| 40         |     1        |     C         |
| 50         |     2        |     A         |
| 60         |     3        |     A         |
| 70         |     3        |     B         |
| 80         |     3        |     D         |
| 90         |     4        |     C         |
+------------+--------------+---------------+

Result table:
+-------------+---------------+
| customer_id | customer_name |
+-------------+---------------+
| 3           | Elizabeth     |
+-------------+---------------+
Only the customer_id with id 3 bought the product A and B but not the product C.
``````

## MySQL Solution

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select customer_id,customer_name
from Customers c
where customer_id in
(select distinct customer_id from Orders
where product_name = 'A'
and customer_id in
(select distinct customer_id from Orders
where product_name = 'B'))
and customer_id not in
(select distinct customer_id from Orders
where product_name = 'C' )
``````