Exercise

First value in a window

Suppose you want to figure out the first OrderDate in each territory or the last one. How would you do that? You can use the window functions FIRST_VALUE() and LAST_VALUE(), respectively! Here are the steps:

First, create partitions for each territory
Then, order by OrderDate
Finally, use the FIRST_VALUE() and/or LAST_VALUE() functions as per your requirement

Instructions

100 XP

Write a T-SQL query that returns the first OrderDate by creating partitions for each TerritoryName.