Practice SQL Window Functions | Xorthax's Trading Post

Tables Used

orderdetails

Column	Type
orderdetailid	bigint
orderid	bigint
productid	bigint
quantity	bigint
unitprice	double precision
currencyid	bigint

orders

Column	Type
orderid	bigint
customerid	bigint
orderdate	timestamp without time zone
totalamount	double precision
status	text

products

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

Expected Output

Column
customerid
category
totalspending
rank

31. Category Spend Royalty

Rank customers by total spending within each product category.

Xorthax wants to determine a unique leaderboard of top spenders for each product category. Assign a distinct rank to each customer within their category based on their total spending, even if some totals are the same.

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