Common Table Expressions (CTEs), also known as queries, take advantage of a particular syntax when writing sub-queries that make statements a lot more readable. Readability, however, is not the only reason to use CTEs: their structure also allows for a statement pipeline of sorts, and in their recursive version, they can be used to loop through joins.
PostgreSQL 11 Server Side Programming Quick Start Guide
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PostgreSQL 11 Server Side Programming Quick Start Guide
By:
Overview of this book
PostgreSQL is a rock-solid, scalable, and safe enterprise-level relational database. With a broad range of features and stability, it is ever increasing in popularity.This book shows you how to take advantage of PostgreSQL 11 features for server-side programming. Server-side programming enables strong data encapsulation and coherence.
The book begins with the importance of server-side programming and explains the risks of leaving all the checks outside the database. To build your capabilities further, you will learn how to write stored procedures, both functions and the new PostgreSQL 11 procedures, and create triggers to perform encapsulation and maintain data consistency.
You will also learn how to produce extensions, the easiest way to package your programs for easy and solid deployment on different PostgreSQL installations.
Table of Contents (12 chapters)
Preface
Free Chapter
PostgreSQL Server-side Programming
Statement Tricks: UPSERTs, RETURNING, and CTEs
The PL/pgSQL Language
Stored Procedures
PL/Perl and PL/Java
Rules and the Query Rewriting System
Extensions
Inter Process Communication and Background Workers
Custom Data Types
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