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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

Pokyny

100 XP

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