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SQL practice question · Medium · Subqueries & CTEs · Microsoft

products lists every product in the Azure catalog (product_id) and customer_contracts has one row per subscription (customer_id, product_id); a customer can hold the same product twice and some contracts may reference retired products that are no longer in products. Return customers who subscribe to every product currently in products. Output column: customer_id. Order by customer_id ascending.

Table: customer_contracts

Schema of customer_contracts
Column	Type
customer_id	INTEGER
product_id	INTEGER

Schema of customer_contracts

Column

Type

customer_id

INTEGER

product_id

INTEGER

Sample rows of customer_contracts
customer_id	product_id
1	10
1	20
1	30
2	10
2	20
3	10
3	20
3	30

Sample rows of customer_contracts

customer_id

product_id

Table: products

Schema of products
Column	Type
product_id	INTEGER

Schema of products

Column

Type

product_id

INTEGER

Sample rows of products
product_id
10
20
30

Sample rows of products

product_id

Expected output on the sample data
customer_id
1
3

Expected output on the sample data

customer_id

Solve it in the live editor on this page — run on sample data, then submit against hidden tests.

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