X_PURCHASES +-------------+---------+ | customer_id | pro_key | +-------------+---------+ | 1 | A | | 1 | B | | 2 | A | +-------------+---------+ ​ PRODUCT_CATALOG_Y +---------+ | pro_key | +---------+ | A | | B | +---------+ ##### Scenario E-commerce team wants to identify customers who have purchased every product currently in the catalog. ##### Question Using SQL (or Python), return the customer_id values who have at least one purchase in X_PURCHASES for every pro_key that appears in PRODUCT_CATALOG_Y. ##### Hints Group by customer and compare counts, or use NOT EXISTS to filter missing products.