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PostgreSQL 14 Administration Cookbook

You're reading from   PostgreSQL 14 Administration Cookbook Over 175 proven recipes for database administrators to manage enterprise databases effectively

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Product type Paperback
Published in Mar 2022
Publisher Packt
ISBN-13 9781803248974
Length 608 pages
Edition 1st Edition
Concepts
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Authors (2):
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Gianni Ciolli Gianni Ciolli
Author Profile Icon Gianni Ciolli
Gianni Ciolli
Simon Riggs Simon Riggs
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Simon Riggs
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Toc

Table of Contents (14) Chapters Close

Preface 1. Chapter 1: First Steps 2. Chapter 2: Exploring the Database FREE CHAPTER 3. Chapter 3: Server Configuration 4. Chapter 4: Server Control 5. Chapter 5: Tables and Data 6. Chapter 6: Security 7. Chapter 7: Database Administration 8. Chapter 8: Monitoring and Diagnosis 9. Chapter 9: Regular Maintenance 10. Chapter 10: Performance and Concurrency 11. Chapter 11: Backup and Recovery 12. Chapter 12: Replication and Upgrades 13. Other Books You May Enjoy

Making views updatable

PostgreSQL supports the SQL standard CREATE VIEW command, which supports automatic UPDATEINSERT, and DELETE commands, provided they are simple enough.

Note that certain types of updates are forbidden just because they are either impossible or impractical to derive a corresponding list of modifications on the constituent tables. We'll discuss those issues here.

Getting ready

First, you need to consider that only simple views can be made to receive insertions, updates, and deletions easily. The SQL standard differentiates between views that are simple and updatable, and more complex views that cannot be expected to be updatable.

So, before we proceed, we need to understand what a simple updatable view is and what it is not. Let's start with the cust table:

postgres=# SELECT * FROM cust;
 customerid | firstname | lastname | age 
------------+-----------+----------+-----
 ...
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