[Solved] Why does the WHERE clause filter out rows before grouping when used with GROUP BY? - Ans: Because WHERE filters rows before aggregation, affecting which rows are grouped | C Sharp (C#)

C Sharp (C#) - LINQ Fundamentals

Why does the WHERE clause filter out rows before grouping when used with GROUP BY?

ABecause WHERE is ignored when GROUP BY is used

BBecause WHERE filters rows before aggregation, affecting which rows are grouped

CBecause WHERE filters after grouping, so it affects groups directly

DBecause WHERE only filters columns, not rows

Step-by-Step Solution

Solution:

Step 1: Understand WHERE and GROUP BY order
WHERE filters rows before aggregation and grouping happens.
Step 2: Clarify effect on grouping
Filtering before grouping changes which rows are included in groups; HAVING filters after grouping.
Final Answer:
Because WHERE filters rows before aggregation, affecting which rows are grouped -> Option B
Quick Check:
WHERE filters before GROUP BY [OK]

Quick Trick: WHERE filters rows before grouping; HAVING filters groups [OK]

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Why does the WHERE clause filter out rows before grouping when used with GROUP BY?