Advanced
## Window Functions in MS SQL Server

Interactive Course

Learn how to use analytic T-SQL functions to deeply understand data.

Window functions are so powerful that they serve as a dividing point in time: people talk about SQL Server before window functions and SQL Server after window functions. Because they were introduced into the standard relatively recently, these functions aren't covered in many T-SQL courses.

This course covers the syntax and semantics of T-SQL window functions. It shows how powerful they are, what the typical use cases are, and how to use ORDER BY and PARTITION BY to set up a frame for window functions. You'll also learn the difference between ROWS and RANGE clauses

This course is intended for intermediate users. We assume the user knows the basics of T-SQL, including:

- How to select from a single table, including writing complex WHERE conditions
- How to JOIN tables
- How GROUP BY and HAVING work

- A web browser
- Knowledge of basic T-SQL, including JOINs and GROUP BY clauses

- Compute running totals and running averages
- Build rankings
- Find best and worst performers
- Investigate trends across time
- Calculate contributions to the whole, such as commission percentages

You'll also get a deeper understanding of T-SQL aggregate functions.

- Beginning database analysts
- Developers who want to keep their knowledge of SQL Server current
- Students taking classes in relational databases
- Anyone who wants to learn SQL window functions

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Course progress

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Exercises completed

Window functions? We'll explain what they're all about

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Your first encounter with window functions

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Discover how to define a function window with PARTITION BY

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Learn how you can rank rows with window functions

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Learn how to create sophisticated window frames for your window functions

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Learn the most essential analytic functions

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Create advanced statistics computed independently for various groups of rows

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Do you know when window functions are evaluated in a T-SQL query? Let's find out!

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Master all the skills you've acquired so far with our practice set

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Test all the skills you've acquired so far with this comprehensive final quiz

Exercises completed