MySQL subquery
\nselect customer_id\nfrom customer c\ngroup by customer_id\nhaving count(distinct product_key)=(select count(distinct product_key) from product)\n\n\n
```\nselect customer_id\nfrom customer c\ngroup by customer_id\nhaving count(distinct product_key)=(select count(distinct product_key) from product)\n\n\n```
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