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Mastering PostgreSQL 15

Mastering PostgreSQL 15

By : Hans-Jürgen Schönig
4.9 (7)
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Mastering PostgreSQL 15

Mastering PostgreSQL 15

4.9 (7)
By: Hans-Jürgen Schönig

Overview of this book

Starting with an introduction to the newly released features of PostgreSQL 15, this updated fifth edition will help you get to grips with PostgreSQL administration and how to build dynamic database solutions for enterprise apps, including designing both physical and technical aspects of the system. You'll explore advanced PostgreSQL features, such as logical replication, database clusters, advanced indexing, and user management to manage and maintain your database. You'll then work with the PostgreSQL optimizer, configure PostgreSQL for high speed, and move from Oracle to PostgreSQL. Among the other skills that the book will help you build, you’ll cover transactions, handling recursions, working with JSON and JSONB data, and setting up a Patroni cluster. It will show you how to improve performance with query optimization. You'll also focus on managing network security and work with backups and replication while exploring useful PostgreSQL extensions that optimize the performance of large databases. By the end of this PostgreSQL book, you’ll be able to use your database to its utmost capacity by implementing advanced administrative tasks with ease.
Table of Contents (16 chapters)
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Handling recursions

Recursions are an important aspect and are supported by the most advanced SQL database engines, including PostgreSQL. Using recursions, many types of operations can be done fairly easily. So, let us dissect the most simplistic recursion and try to understand how recursion works. Here is an example:

test=# WITH RECURSIVE x(n) AS (
    SELECT  1 AS n, 'a'::text AS dummy
    UNION ALL
    SELECT  n + 1, dummy || 'a'
    FROM    x
    WHERE   n < 5
)
SELECT
FROM    x;
 n | dummy
---+-------
 1 | a
 2 | aa
 3 | aaa
 4 | aaaa
 5 | aaaaa
(5 rows)

The goal of this query is to recursively return numbers and compile a string at the end. Basically, the query consists of two parts: the WITH RECURSIVE part and the SELECT statement at the end starting the recursion. While the...

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