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Question 9
What are the benefits of using subqueries in SQL? Select all that apply.
Subqueries cannot be used within the same query.
Subqueries can be nested in a SET command.
Subqueries make code more readable and maintainable.
Subqueries can make projects easier and more efficient.
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Correct answers:
- Subqueries can be nested in a SET command.
- Subqueries make code more readable and maintainable.
- Subqueries can make projects easier and more efficient.
Explanation: Subqueries are commonly used inside SET (e.g., UPDATE ... SET col = (SELECT ...)), they help break complex logic into readable pieces, and they can simplify and sometimes improve performance or reduce application-side work. The first statement is false — subqueries are used within the same query.
- Subqueries can be nested in a SET command.
- Subqueries make code more readable and maintainable.
- Subqueries can make projects easier and more efficient.
Explanation: Subqueries are commonly used inside SET (e.g., UPDATE ... SET col = (SELECT ...)), they help break complex logic into readable pieces, and they can simplify and sometimes improve performance or reduce application-side work. The first statement is false — subqueries are used within the same query.
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