MySQL Clean Solution | Detail Explanation
Intuition\n Describe your first thoughts on how to solve this problem. \nWe\'re tasked with finding the customer IDs from the Customer table who have bought all
# Intuition\n<!-- Describe your first thoughts on how to solve this problem. -->\nWe\'re tasked with finding the **`customer IDs`** from the **`Customer table`** who have bought all the products listed in the **`Product table`**. To achieve this, we need to identify customers who have purchased all the **`products`** in the **`product list`**.\n\n# Approach\n<!-- Describe your approach to solving the problem. -->\n- Use a **`GROUP BY`** clause to group the records in the **`Customer table`** by **`customer_id`**.\n- Use the **`HAVING`** clause to filter out **`customers`** who have purchased *`all products`*.\n- This is done by **`counting`** the **`distinct product_key`** values for each **`customer`** and comparing it with the total **`count`** of **`products`** in the **`Product table`**.\n\n# Code\n```\n# Write your MySQL query statement below\nSELECT customer_id\nFROM Customer\nGROUP BY customer_id\nHAVING COUNT(DISTINCT product_key) = (\n    SELECT COUNT(product_key)\n    FROM Product\n);\n```
['Database', 'MySQL']