How do SQL queries return correct results? Databases for Developers #18

If your application is successful, you'll have many people using it at the same time.
But what happens when two or more people read and write to the same rows at the same time?
The SQL standard defines three problems that could happen:
- Dirty reads
- Non-repeatable reads
- Phantom reads
This video explains what these are. And discusses how to manage these effects by setting the isolation level for your transaction.
Take the course:
devgym.oracle.com/pls/apex/dg...
Need help with SQL? Ask us over on AskTOM: asktom.oracle.com
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All Things SQL blog: blogs.oracle.com/sql/
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The Magic of SQL with Chris Saxon
Copyright © 2015 Oracle and/or its affiliates. Oracle is a registered trademark of Oracle and/or its affiliates. All rights reserved. Other names may be registered trademarks of their respective owners. Oracle disclaims any warranties or representations as to the accuracy or completeness of this recording, demonstration, and/or written materials (the “Materials”). The Materials are provided “as is” without any warranty of any kind, either express or implied, including without limitation warranties or merchantability, fitness for a particular purpose, and non-infringement.

[@AdamBaverman]

первое что посмотрел из обучения по SQL, и наверное это самый лучший ускоренный курс введения в логику SQL!
Спасибо тебе, Крис!

[@sbortisliza2066]

you are really saved my life
i adore ur videos and how u are explication
thank you so much
i hope u post tutorials of php or python3

[@TheMagicofSQL]

Thanks.
My colleague, Blaine Carter, has a video series on using Python to connect to Oracle Database: czcams.com/video/rPfKXVmYuyg/video.html

[@KaranMidha-ki8ev]

please remove the sound track from videos

[@TheMagicofSQL]

We'll bear this in mind for future videos