Answer
IN checks if a value exists within a list of values and simplifies conditional queries.
Quick Answer
IN checks if a value matches any value in a list. SELECT * FROM users WHERE country IN ("USA", "UK", "Canada"). Equivalent to multiple OR conditions but more readable. Can also use a subquery: WHERE id IN (SELECT user_id FROM orders WHERE total > 100). NOT IN excludes listed values. Caution: NOT IN with a subquery that returns NULL values can give unexpected results.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ