Understanding Transaction Processing
Transaction processing is used to maintain database integrity by ensuring that batches of SQL operations execute completely or not at all.
As explained back in Lesson 12, “Joining Tables,” relational databases are designed so that data is stored in multiple tables to facilitate easier data manipulation, management, and reuse. Without going in to the hows and whys of relational database design, take it as a given that well-designed database schemas are relational to some degree.
The Orders tables that you've been using in the past 18 lessons are a good example of this. Orders are stored in two tables: Orders stores actual orders, and OrderItems stores the individual items ordered. These two tables are related ...
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