Tables Used

products

Column	Type
productid	bigint
name	text
description	text
category	text
price	double precision
supplierid	bigint
stockquantity	bigint

suppliers

Column	Type
supplierid	bigint
name	text
originplanet	text
contactinfo	text
rating	double precision

Expected Output

Column
supplierid
suppliername
averageprice
pricingtier

Supplier Pricing Pyramid :Group Suppliers by Average Product Cost into Three Pricing Tiers Intermediate

Q: Do I need advanced SQL to attempt this?

This problem is labeled as Intermediate. It assumes you’ve written a few window function queries before, but you don’t need to be an expert. Use the hints and explanations if you get stuck — they’re there to help you think through the logic.

Divide suppliers into 3 pricing bands based on average product cost.

Xorthax is evaluating suppliers based on the average price of the products they supply. Divide suppliers into 3 pricing tiers.

Write Your Query

Answer:

          select s.supplierid,
       s.name as suppliername,
       avg(p.price) as averageprice,
       ntile(3) over (
                      order by avg(p.price) desc) as pricingtier
from suppliers s
join products p on s.supplierid = p.supplierid
group by s.supplierid,
         s.name;

It reflects supplier benchmarking where businesses analyze average pricing to categorize vendors into competitive tiers.

You’ll practice aggregating and segmenting data to rank suppliers by pricing patterns across their product offerings.

This problem is labeled as Intermediate. It assumes you’ve written a few window function queries before, but you don’t need to be an expert. Use the hints and explanations if you get stuck — they’re there to help you think through the logic.

Yes. Every problem comes with optional hints you can reveal one at a time, plus a fully worked step-by-step solution. You decide how much help you want while practicing.

All problems on PracticeWindowFunctions.com are completely free and can be solved without creating an account. Right now there are over 80 practice problems, with new ones added regularly.

SQL for Data Analysis (O’Reilly)

SQL techniques tailored for analytics and reporting workflows.

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Tables Used

Expected Output

Supplier Pricing Pyramid :Group Suppliers by Average Product Cost into Three Pricing Tiers Intermediate

Divide suppliers into 3 pricing bands based on average product cost.

What real-world scenario does this represent?

What SQL concepts will I practice here?

Do I need advanced SQL to attempt this?

Will I get hints and step-by-step explanations if I get stuck?

Are the problems free to access, and how many are available?

SQL for Data Analysis (O’Reilly)