September 2014
Intermediate to advanced
384 pages
9h 28m
English
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Chapter 4. Transactions and Locks
The SQL-99 specification defines transaction in this way:
"An SQL-transaction (transaction) is a sequence of executions of SQL-statements that is atomic with respect to recovery. That is to say: either the execution result is completely successful, or it has no effect on any SQL-schemas or SQL-data.
The SQL Standard"
So, a transaction is an important feature that guarantees the integrity of data. It is useful to prevent the data from remaining in an inconsistent state when an operation fails. Suppose, for example, we are administering a database for an e-commerce website. We have several tables; one of them stores the orders, and the others store the available products and their quantity. When a customer buys a product, ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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