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
productid
orderdate
quantity
unitprice
futureprice
pastprice

4. Two Orders Before, Two Orders After: The Price Prophecy

Analyze price changes across the timeline of trade.

Xorthax wants to analyze price trends for products over time. For each Product ID, find the Order Date, Quantity, current unit price and the unit price two orders before and after the current order date.

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