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Tag Archives for " Common Table Expression "

Learn how to Calculate the Median Value using PERCENTILE_DISC

In this puzzle we’re going to learn how to find the person whose birthday, among others, is in the middle.  Knowing how to calculate the median value is a good skill to have.  As you start to explore business intelligence you’ll come across similar problems to solve. Also, be sure to check out the bonus […]

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Recursive CTEs Explained

Recursive CTE’s In this article we explore recursive CTE’s (Common Table Expressions).  Recursive CTEs are special in the sense they are allowed to reference themselves!  Because of this special ability, you can use recursive CTEs to solve problems other queries cannot.  Recursive CTEs are really good at working with hierarchical data such as org charts […]

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Non Recursive CTEs Explained and Why to Use Them

Introduction to Non Recursive CTEs In this article we explore non recursive CTEs (Common Table Expressions).  This is a broad class, and basically covers every form of CTEs except those that call themselves.  This other class is called the recursive CTEs; they are covered in the next article. If you’re unfamiliar with CTEs I would […]

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Introduction to Common Table Expressions (CTE’s)

Common Table Expressions or CTE’s for short are used within SQL Server to simplify complex joins and subqueries, and to provide a means to query hierarchical data such as an organizational chart.  In this set of articles, we’ll introduce you to common table expressions, the two types, and their uses.  In this article we’ll introduce […]

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