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For example, you might have a column that holds an order number but it is not mandatory. You Ensuring Data Integrity through Constraints 14-9 might then add a constraint which specifies that the column must have a value if the salesperson column also has a value. Triggers Triggers are procedures (somewhat like stored procedures) that are executed whenever specific events like INSERT or UPDATE occur on a specific object such as a table. In the code for the trigger, you can then enforce even more complex rules for integrity.

13-26 Implementing a Microsoft® SQL Server® 2008 R2 Database Lesson 5 Alternatives to Functions Functions are only one option for implementing code. This lesson explores situations where other solutions may or may not be appropriate and helps you make decisions about which solution to use. Objectives After completing this lesson, you will be able to: • • Compare table-valued functions and stored procedures Compare inline functions and views Designing and Implementing User-Defined Functions 13-27 Comparing Table-valued Functions and Stored Procedures Key Points Table-valued functions and stored procedures can often be used to achieve similar outcomes.

They typically need to be retranslated by upper layers of code before being presented to the end users. Multiple Tiers The correct solution in most situations involves rules and checks being applied at multiple levels. The challenge with this, though, is in maintaining consistency between the rules and checks at different application levels. 14-6 Implementing a Microsoft® SQL Server® 2008 R2 Database Types of Data Integrity Key Points There are three basic forms of data integrity commonly enforced in database applications: domain integrity, entity integrity, and referential integrity.

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