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Learning PostgreSQL 11 - Third Edition

You're reading from  Learning PostgreSQL 11 - Third Edition

Product type Book
Published in Jan 2019
Publisher
ISBN-13 9781789535464
Pages 556 pages
Edition 3rd Edition
Languages
Authors (2):
Salahaldin Juba Salahaldin Juba
Profile icon Salahaldin Juba
Andrey Volkov Andrey Volkov
Profile icon Andrey Volkov
View More author details
Toc

Table of Contents (18) Chapters close

1. Relational Databases 2. PostgreSQL in Action 3. PostgreSQL Basic Building Blocks 4. PostgreSQL Advanced Building Blocks 5. SQL Language 6. Advanced Query Writing 7. Server-Side Programming with PL/pgSQL 8. OLAP and Data Warehousing 9. Beyond Conventional Data Types 10. Transactions and Concurrency Control 11. PostgreSQL Security 12. The PostgreSQL Catalog 13. Optimizing Database Performance 14. Testing 15. Using PostgreSQL in Python Applications 16. Scalability 17. What's Next? 18. Other Books You May Enjoy

Transactions

A transaction is a set of operations that might include updating, deleting, inserting, and retrieving data. These operations are often embedded in a higher-level language, or can be explicitly wrapped in a transaction block using BEGIN and END statements. A transaction is successfully executed if all the operations with in the transaction are executed successfully. If an operation in a transaction fails, the effect of the partially executed operation on the transaction can be undone.

To control the beginning and end of a transaction explicitly, the BEGIN statement can be used to denote the start of the transaction, and the statements END or COMMIT to denote the end of the transaction. The following example shows how to explicitly execute an SQL statement in a transaction:

BEGIN; 
CREATE TABLE employee (id serial primary key, name text, salary numeric);
COMMIT;

One use...

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