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CHAPTER 4 DATA TYPES, TABLES, AND CONSTRAINTS
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Better DBA Learning SQL Server Express A+ Better DBA The Life of Jesus Christ A (3 row(s) affected) The final portion of the script in Ch04FKMany-to-many.sql makes a change to the last name of the student named Better DBA. Although this change does not directly depend on referential integrity, it is typical of the kind of change that will be made in applications that implement referential integrity. Let s assume Better DBA marries a preacher named Inspirational Minister. Because she has already attracted attention as an exceptional DBA, Better DBA does not want to totally give up her former last name. After her marriage, she changes her name to a hyphenated form (DBA-Minister). Then, she goes to the Office of the Registrar at her school and submits a request to change her last name. The following excerpt shows the code to implement the update and a new version of the result set to confirm the revision. The result set derives from the standard SELECT statement for this sample joining the Classes, Students, and ClassGrades tables. UPDATE Students SET LastName = 'DBA-Minister' WHERE StudentID = 2 GO FullName ------------------Poor DBA Better DBA-Minister Better DBA-Minister ClassTitle --------------------------Learning SQL Server Express Learning SQL Server Express The Life of Jesus Christ GradeLetter ----------C+ A+ A
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This chapter showed you how to create tables for the solutions that you build with SSE. Tables are at the heart of every custom database solution. If you can t build your own tables, you are limited to selecting from tables created by other developers and administrators. Even in this case, knowing about the table design issues covered in this chapter can help you to design smarter SELECT statements and to debug your SELECT statements faster. Because data types are so fundamental to your ability to create tables, the chapter commenced with a review that summarized and contrasted the more than two dozen SSE data types. Next, the focus shifted to creating tables with columns based on SQL Server data types. You also learned how to populate tables with data as well as how to recover data from an old version of the table and restore the data to a new version of the table. The chapter closed with two lengthy sections that drilled down on data integrity. By building tables that take advantage of the many features that SSE offers for managing the quality of data that enters a database, you ensure that your database solutions are never characterized as garbage in, garbage out.
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n the previous couple of chapters, you learned how to create databases and tables to store data. This chapter switches attention to retrieving data. The process of retrieving data is frequently called data access. There are two major aspects of data access covered in this chapter. 1. First, you ll learn about specifying SELECT statements for data access. This topic includes designating items for a SELECT statement to return as well as indicating where to retrieve data from. In the process, you also acquire a variety of tips and techniques for displaying and processing date and time values as well as computing calculated values for display. 2. Second, you ll receive training in filtering, grouping, and aggregating values from a data source. These actions can summarize values from a data source to make result sets have a greater impact. Among the specific topics addressed are how to filter character data and how to use special operators that can help you filter characters and numbers. In addition to covering core data access topics, this chapter also includes content on innovations or advanced features that help you get the most from a SQL Server Express instance. This chapter drills down on the TOP keyword to demonstrate how to select fixed and variable subsets of rows from the beginning rows of a result set. You learn a couple of ways of performing queries for data sources on remote SQL Server instances, including SQL Server Express, other SQL Server 2005 editions, MSDE, SQL Server 2000, and SQL Server 7.
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