[Solved] Which of the following best describes a subquery used with IN in a WHERE clause? — Ans: A query that returns multiple rows to compare against a column. | PostgreSQL

PostgreSQL - Subqueries in PostgreSQL

Which of the following best describes a subquery used with IN in a WHERE clause?

AA query that always returns a single value.

BA query that modifies data in the main query's table.

CA query that creates a new table for the main query.

DA query that returns multiple rows to compare against a column.

Step-by-Step Solution

Solution:

Step 1: Identify the purpose of subqueries with IN
Subqueries with IN return multiple rows to check if a value exists in that set.
Step 2: Compare options
A subquery with IN returns multiple rows to compare against a column.
Final Answer:
A query that returns multiple rows to compare against a column. -> Option D
Quick Check:
Subquery with IN = multiple rows returned [OK]

Quick Trick: Subquery with IN returns multiple values to match [OK]

Common Mistakes:

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Which of the following best describes a subquery used with IN in a WHERE clause?