QuerydrillProducts never sold
An SQL exercise from Querydrill. Solve it with a SQL editor in your browser, checked on the rows it returns and again on changed data, and it is checked the moment you submit.
The task
Return the names of products that appear on no order line.
What this exercise teaches
LEFT JOIN plus IS NULL, or NOT EXISTS, both find rows with no match.
A hint if you get stuck
Same pattern as customers who never ordered.
This exercise is part of Pro
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