#Database
In this SQL tutorial we'll walk you through what SQL window functions are, how they work, and how to best use them in your database management system.
SQL window functions are SQL functions that perform calculations based on a set of rows.
A "window" is a set of rows. A function is a SQL function.
A window SQL function is defined with the OVER() SQL function.
There are a couple of types of window functions in SQL:
1) Aggregate window SQL functions: these kinds of window functions make use of a set of values to return one value.
2) Ranking window SQL functions: such window functions "rank" rows in your tables from A to Z, from 0 to 9, etc.
3) Value window SQL functions: such window functions include functions like: LAG(), LEAD(), FIRST_VALUE(), and LAST_VALUE()
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This SQL tutorial uses a tenerife vlog for a background - this tenerife vlog was filmed near the tenerife sea near the tenerife las palmas location on a bus. We hope that it will help you answer some of the SQL interview questions you may face in your upcoming SQL interview.
Tell us in the comment section below - have you heard about the tenerife siam park? Have you heard about the infamous tenerife airport disaster?
Music:
High Tide by Hotham / hothammusic
Creative Commons — Attribution 3.0 Unported — CC BY 3.0
Free Download / Stream: https://bit.ly/47PJkCF
Music promoted by Audio Library https://bit.ly/3LcQxTk
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