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
category
distinctartifactssold

16. 30 Days of Distinct Artifacts

Measure the unique items sold per category over the last month.

The inventory of cosmic artifacts at Xorthax's trading post is vast. Help him determine how many distinct artifacts have been sold in the last 30 days for each category. Use a CTE to filter the data, and then apply a window function.

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