5. Customers Who Bought Every Product
HardAdvanced Filteringrelational divisionCOUNT(DISTINCT)HAVING
Relational division answers "find rows related to all of a set". The trick: count the distinct matches per group and compare to the size of the full set.
Task: return the customers who have purchased every product in the
products table. Order by customer.
Tables
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Expected outputrows must come back in this order
Computing expected output…
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