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  2. पाठ्यक्रम
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  3. Introduction to Oracle SQL
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अभ्यास

Under pressure

Are there some tracks that have never been bought? Let's find out.

For the moment, let's find out which tracks have been bought at least once.

निर्देश

100 XP
  • Find the tracks that appear in the Track table, that also appear in the InvoiceLine one.