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You're reading from  jOOQ Masterclass

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Published inAug 2022
Reading LevelBeginner
PublisherPackt
ISBN-139781800566897
Edition1st Edition
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Anghel Leonard
Anghel Leonard
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Anghel Leonard

Anghel Leonard is a Chief Technology Strategist and independent consultant with 20+ years of experience in the Java ecosystem. In daily work, he is focused on architecting and developing Java distributed applications that empower robust architectures, clean code, and high-performance. Also passionate about coaching, mentoring and technical leadership. He is the author of several books, videos and dozens of articles related to Java technologies.
Read more about Anghel Leonard

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Ordered set aggregate functions (WITHIN GROUP)

Ordered set aggregate functions allow operations on a set of rows sorted with ORDER BY via the mandatory WITHIN GROUP clause. Commonly, such functions are used for performing computations that depend on a certain row ordering. Here, we can quickly mention hypothetical set functions such as RANK(), DENSE_RANK(), PERCENT_RANK(), or CUME_DIST(), and inverse distribution functions such as PERCENTILE_CONT(), PERCENTILE_DISC(), or MODE(). A particular case is represented by LISTAGG(), which is covered at the end of this section.

Hypothetical set functions

A hypothetical set function calculates something for a hypothetical value (let's denote it as hv). In this context, DENSE_RANK() computes the rank of hv without gaps, while RANK() does the same thing but with gaps. CUME_DIST() computes the cumulative distribution of hv (the relative rank of a row from 1/n to 1), while PERCENT_RANK() computes the percent rank of hv (the relative...

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jOOQ Masterclass
Published in: Aug 2022Publisher: PacktISBN-13: 9781800566897
© 2022 Packt Publishing Limited All Rights Reserved

Author (1)

author image
Anghel Leonard

Anghel Leonard is a Chief Technology Strategist and independent consultant with 20+ years of experience in the Java ecosystem. In daily work, he is focused on architecting and developing Java distributed applications that empower robust architectures, clean code, and high-performance. Also passionate about coaching, mentoring and technical leadership. He is the author of several books, videos and dozens of articles related to Java technologies.
Read more about Anghel Leonard

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