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What is the difference between INNER JOIN and LEFT JOIN in SQL?
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What is the purpose of the GROUP BY clause in SQL?
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What is a subquery in SQL, and how is it different from a join?
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How do you add a new column to an existing table in SQL?
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What is the difference between UNION and UNION ALL in SQL?
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What is the purpose of the HAVING clause in SQL, and how does it differ from the WHERE clause?
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