Suggested Practices in .NET

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Suggested Practices
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To help you successfully master the exam objectives presented in this chapter, complete the following practice tasks.
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Barcode Scanner In .NET
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Practice 1: Managing Database Schemas Practice 2: Managing Recovery Models
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Practice creating a schema; then transfer a schema to a new owner and drop the original user who owned the schema. Using the AdventureWorks database, compare the performance of the backup performed when the database is configured to use the Simple recovery model versus the Full recovery model.
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Take a Practice Test
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The practice tests on this book s companion CD offer many options. For example, you can test yourself on just the content covered in this chapter, or you can test yourself on all the 70-431 certification exam content. You can set up the test so that it closely simulates the experience of taking a certification exam, or you can set it up in study mode so that you can look at the correct answers and explanations after you answer each question.
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MORE INFO
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Practice tests
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For details about all the practice test options available, see the section titled How to Use the Practice Tests in this book s Introduction.
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Recognize Bar Code In Java
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3
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Creating Tables, Constraints, and User-Defined Types
The entire purpose of a database is to store and return data. These tasks would not be possible without the structure that database tables provide. Tables are the basic building blocks of a database. And the choices you make when designing a table affect the amount of space consumed on disk, the amount of memory consumed when processing data, and the queries required to manipulate the data for application use. This chapter lays the foundation for building high-performing databases. We begin by looking at how to define the columns within a table to enforce a structure for your data that supports business rules while using minimum storage resources. After you understand how to appropriately define columns, you can create your table and assign permissions to allow access to the table. This chapter then discusses the Microsoft SQL Server constraints you can use to further enforce business rules, and it ends with coverage of user-defined types (UDTs) that you can create to enforce consistent column definitions within your database or to create entirely new data types that SQL Server doesn t provide.
Exam objectives in this chapter:
Implement a table.
Specify column details. Specify the filegroup. Assign permissions to a role for tables. Specify the scope of a constraint. Create a new constraint. Create a Transact-SQL user-defined type. Specify details of the data type. Create a CLR user-defined type.
Implement constraints.
Create user-defined types.
3
Creating Tables, Constraints, and User-Defined Types
Lessons in this chapter:
Lesson 1: Creating Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107 Lesson 2: Implementing Constraints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127 Lesson 3: Creating User-Defined Types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
Before You Begin
To complete the lessons in this chapter, you must have
SQL Server 2005 installed. A copy of the AdventureWorks sample database installed in the instance or an empty database created.
Implementing tables
IMPORTANT
The placement of this chapter creates a chicken-and-egg dilemma. You can t have a chicken without an egg, and you can t have an egg without a chicken. The same is true for SQL Server tables. You can t define a table without using Transact-SQL. And tables aren t much use if they don t contain any data, which you place into the table by using Transact-SQL. However, we can t teach Transact-SQL without first explaining tables. In this book, we cover table creation first. And as much as possible, this chapter avoids discussing the details of using Transact-SQL, which is covered in later chapters.
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