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Which of the following best describes a subquery used with the IN operator?

easy📝 Conceptual Q2 of 15
SQL - Subqueries
Which of the following best describes a subquery used with the IN operator?
AA query that deletes rows from a table
BA query that updates values in a table
CA query inside parentheses that returns multiple values
DA query that creates a new table
Step-by-Step Solution
Solution:

  1. Step 1: Define subquery with IN operator

    A subquery used with IN is a query inside parentheses that returns a list of values.

  2. Step 2: Understand its purpose

    This list is used to filter rows where a column's value matches any value in the list.

  3. Final Answer:

    A query inside parentheses that returns multiple values -> Option C

  4. Quick Check:

    Subquery with IN = returns multiple values [OK]
Quick Trick: Subquery with IN returns multiple values in parentheses [OK]
Common Mistakes:
MISTAKES
  • Thinking subquery modifies data
  • Confusing subquery with DML operations
  • Assuming subquery returns a single value only

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