Solution:Step 1: Analyze the GROUPING SETS clauseIt includes three grouping sets: region alone, product alone, and region with product together.Step 2: Understand output rowsThe output will have sums for each region, each product, and each region-product pair.Final Answer:Totals by region, totals by

[Solved] Consider the query:SELECT region, product, SUM(sales) FROM sales_data GROUP BY GROUPING SETS ((region), (product), (region, product));What does the output include? | PostgreSQL

PostgreSQL - Aggregate Functions and GROUP BY

Consider the query:

SELECT region, product, SUM(sales) FROM sales_data GROUP BY GROUPING SETS ((region), (product), (region, product));

What does the output include?

ATotals by region, totals by product, and totals by region and product combined

BOnly totals by region and product combined

COnly totals by region

DOnly totals by product

Step-by-Step Solution

Solution:

Step 1: Analyze the GROUPING SETS clause
It includes three grouping sets: region alone, product alone, and region with product together.
Step 2: Understand output rows
The output will have sums for each region, each product, and each region-product pair.
Final Answer:
Totals by region, totals by product, and totals by region and product combined -> Option A
Quick Check:
GROUPING SETS can combine single and multi-column groupings [OK]

Quick Trick: GROUPING SETS can mix single and combined column groups [OK]

Common Mistakes:

Assuming only one grouping set is returned
Ignoring combined grouping sets
Confusing with ROLLUP or CUBE

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Consider the query:

Step 1: Analyze the GROUPING SETS clause

Step 2: Understand output rows

Final Answer:

Quick Check:

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