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8 Review
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To further practice and reinforce the skills you learned in this chapter, you can perform the following tasks:
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Review the chapter summary. Review the list of key terms introduced in this chapter. Complete the case scenarios. These scenarios set up real-word situations involving the topics of this chapter and ask you to create a solution. Complete the suggested practices. Take a practice test.
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Summary
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Conflicts occur when updates to the same data occur at different Subscribers at the same time and those Subscribers then synchronize with the Publisher. These conflicts are resolved through the application of conflict resolution policies. PRIMARY KEY constraints can encompass multiple columns and enforce uniqueness, but they do not allow for NULL values. Multiple UNIQUE constraints can be applied to a table. FOREIGN KEY constraints allow only values that exist in the target column. CHECK constraints evaluate entered data against a logical statement. DEFAULT definitions set a default value for a column if none is entered. An AFTER trigger performs an action once a modification in a transaction has been made. An INSTEAD OF trigger performs an action instead of allowing the modification in the transaction to occur. The 28 base Transact-SQL data types can be used to ensure that only a specific type of data can be entered into a column. An alias data type is a custom version of one of these 28 types and is used to standardize the formatting of data across many tables within a database. User-defined types (UDTs) allow you to extend the scalar type system, can contain more than one element, and allow the storage of CLR objects.
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8 Review
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Key Terms
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Do you know what these key terms mean You can check your answers by looking up the terms in the glossary at the end of the book.
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AFTER trigger alias data type Article CHECK constraint conflict resolution policy DEFAULT definition FOREIGN KEY constraint INSTEAD OF trigger nullability PRIMARY KEY constraint Publisher Queue Reader Agent Subscriber Transact-SQL data type UNIQUE constraint user-defined data type
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Case Scenarios
In the following case scenarios, you will apply what you ve learned about defining constraints and enforcing data integrity. You can find answers to these questions in the Answers section at the end of this book.
Case Scenario 1: Making Implicit Constraints Explicit
Contoso provides IT support for the department of automobile licensing and registration. The department has 20 offices in metropolitan and regional areas. The Central Business District (CBD) office has a SQL Server 2005 computer that acts as a Publisher. Each of the 19 offices has a SQL Server 2005 computer configured as a Subscriber.
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1. The department wants to ensure that if a conflict occurs, the SQL Server 2005 computer in the CBD has priority. Which conflict resolution policy should be implemented 2. The department wants to ensure that only one of the approved localities from the localities table can be entered in the drivers_license table. How might this be achieved 3. The department wants to ensure that license plate data entered into the database contains three letters followed by three numbers. How might this be achieved
Case Scenario 2: Data Types
Tailspin Toys is setting up a table within its inventory database to record information about its network. This table will record information such as the Ethernet card address, which software is installed on each computer, and licensing information. 1. Which Transact-SQL data type would be most suitable for storing each number in an IPv4 IP address 2. Which Transact-SQL data type would be the most suitable for storing the 12-digit hexadecimal MAC addresses of ethernet cards 3. An inventory utility writes each computer s software configuration to a consistently formatted, extensible markup language file. Which Transact-SQL data type would you apply to a column that you want to use to store these files
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