SQL Practice
Real-life business problems on real tables. Read the scenario, write the query, and get it checked instantly.
Intermediate25 pts
Revenue by product category
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Customers who never ordered
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Which sellers get their goods sent back?
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Paying customers who never opened the product
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Earning more than your manager
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Which department sees the most abnormal lab results?
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Busiest routes and what they cost in minutes
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The silent shelf: tracks nobody has played
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