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Add: first_value in SQL roadmap #10267

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Add: first_value in SQL roadmap #10267

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7 changes: 7 additions & 0 deletions roadmaps/sql/content/first_value.md
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# First_value

FIRST\_VALUE() function is a window function that returns the first value in an ordered set of values. It allows you to fetch data from the first row of a specific window frame without having to use complex self-joins.

Visit the following resources to learn more:

- [@video@FIRST VALUE function in SQL Server](https://www.youtube.com/watch?v=pUCmWi96V3A&pp=ygUSZmlyc3QgdmFsdWUgaW4gc3Fs/)