What does a scalar subquery return in PostgreSQL?

easy📝 Conceptual Q11 of 15

PostgreSQL - Subqueries in PostgreSQL

AA single value used inside another query

BMultiple rows and columns

COnly table names

DA list of table columns

Step-by-Step Solution

Solution:

Step 1: Understand scalar subquery definition
A scalar subquery returns exactly one value, not multiple rows or columns.
Step 2: Compare options with definition
Only A single value used inside another query describes a single value used inside another query, matching the scalar subquery concept.
Final Answer:
A single value used inside another query -> Option A
Quick Check:
Scalar subquery = single value [OK]

Quick Trick: Scalar subqueries always return one value only [OK]

Common Mistakes:

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