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Mastering PostgreSQL 17

You're reading from   Mastering PostgreSQL 17 Elevate your database skills with advanced deployment, optimization, and security strategies

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Product type Paperback
Published in Dec 2024
Publisher Packt
ISBN-13 9781836205975
Length 474 pages
Edition 6th Edition
Languages
Concepts
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Author (1):
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Hans-Jürgen Schönig Hans-Jürgen Schönig
Author Profile Icon Hans-Jürgen Schönig
Hans-Jürgen Schönig
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Table of Contents (16) Chapters Close

Preface 1. Chapter 1: What is New in PostgreSQL 17 2. Chapter 2: Understanding Transactions and Locking FREE CHAPTER 3. Chapter 3: Making Use of Indexes 4. Chapter 4: Handling Advanced SQL 5. Chapter 5: Log Files and System Statistics 6. Chapter 6: Optimizing Queries for Good Performance 7. Chapter 7: Writing Stored Procedures 8. Chapter 8: Managing PostgreSQL Security 9. Chapter 9: Handling Backup and Recovery 10. Chapter 10: Making Sense of Backups and Replication 11. Chapter 11: Deciding on Useful Extensions 12. Chapter 12: Troubleshooting PostgreSQL 13. Chapter 13: Migrating to PostgreSQL 14. Index 15. Other Books You May Enjoy

Utilizing windowing functions and analytics

Now that we have discussed ordered sets, it is time to take a look at windowing functions. Aggregates follow a fairly simple principle: take many rows and turn them into fewer aggregated rows. A windowing function is different. It compares the current row with all rows in the group. The number of rows returned does not change. Here is an example:

test=# SELECT avg(production) FROM t_oil;
    avg
-----------
 2607.5139
(1 row)
test=# SELECT
    country,
    year,
    production,
    consumption,
    avg(production) OVER ()
FROM t_oil
LIMIT 4;
country  | year  | production | consumption |   avg
---------+-------+------------+-------------+----------
USA      | 1965  |       9014 |     &...
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