[Solved] What is the main purpose of using the WINDOW clause in PostgreSQL? — Ans: To define named window specifications for reuse in the query | PostgreSQL

PostgreSQL - Window Functions in PostgreSQL

What is the main purpose of using the WINDOW clause in PostgreSQL?

ATo join multiple tables using window functions

BTo create temporary tables for complex queries

CTo define named window specifications for reuse in the query

DTo specify the order of rows in a SELECT statement

Step-by-Step Solution

Solution:

Step 1: Understand the role of WINDOW clause
The WINDOW clause allows defining named window specifications once for reuse.
Step 2: Compare options with WINDOW clause purpose
Options A, B, and C describe other SQL features, not the WINDOW clause.
Final Answer:
To define named window specifications for reuse in the query -> Option C
Quick Check:
WINDOW clause = named window reuse [OK]

Quick Trick: WINDOW clause defines reusable window specs [OK]

Common Mistakes:

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What is the main purpose of using the WINDOW clause in PostgreSQL?