[Solved] Why are window functions needed in SQL?SELECT with window functions can do what that regular aggregation cannot? | SQL

SQL - Window Functions Fundamentals

Why are window functions needed in SQL?
SELECT with window functions can do what that regular aggregation cannot?

AThey speed up query execution by skipping indexes.

BThey allow calculations across rows without hiding individual rows.

CThey automatically create new tables for results.

DThey replace the need for JOIN operations.

Step-by-Step Solution

Solution:

Step 1: Understand aggregation vs window functions
Regular aggregation groups rows and returns fewer rows, hiding details.
Step 2: Identify window function behavior
Window functions calculate values across rows but keep all original rows visible.
Final Answer:
They allow calculations across rows without hiding individual rows. -> Option B
Quick Check:
Window functions keep rows visible = A [OK]

Quick Trick: Window functions keep all rows, aggregations reduce rows [OK]

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