[Solved] When should you prefer using a window function over a GROUP BY clause? — Ans: When you want to calculate a value for each row based on other rows without... | SQL

SQL - Window Functions Fundamentals

When should you prefer using a window function over a GROUP BY clause?

AWhen you want to calculate a value for each row based on other rows without losing row details.

BWhen you want to aggregate data and reduce the number of rows.

CWhen you want to filter rows before aggregation.

DWhen you want to join two tables.

Step-by-Step Solution

Solution:

Step 1: Identify use case for window functions
Window functions calculate values like running totals or ranks per row without grouping rows together.
Step 2: Compare with GROUP BY use case
GROUP BY reduces rows by grouping, so it is not suitable when you want to keep all rows.
Final Answer:
Calculate a value for each row based on other rows without losing row details. -> Option A
Quick Check:
Use case for window function = A [OK]

Quick Trick: Use window functions to keep all rows with extra calculations [OK]

Common Mistakes:

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When should you prefer using a window function over a GROUP BY clause?