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Review
Comparisons with NULL
Functions with NULL
COALESCE to the rescue
NULLIF
Review and practice
28. Exercise 5

Instruction

Nice! Go, go, go!

Exercise

For each product with a non-NULL name, show its id and the number of advertisements associated with it. Sort the results by the id in descending order.

Stuck? Here's a hint!

It's a quiz. No hints this time.