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Creator QR Code in C# Lesson 4: Views CHAPTER 5 189

Lesson 4: Views CHAPTER 5 189
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QR-Code Scanner In Visual C#.NET
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chapter Review
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Bar Code Reader In C#
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To practice and reinforce the skills you learned in this chapter further, you can perform the following tasks:
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QR Code JIS X 0510 Creation In Visual Studio .NET
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Review the chapter summary. Review the list of key terms introduced in this chapter. Complete the case scenario. These scenarios set up real-world situations involving the topics in 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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SQL Server allows you to create four programmable objects: functions, stored procedures, triggers, and views. Functions can return a scalar value or a result set but are not allowed to change the state of a database or SQL Server instance. Stored procedures provide a programming API that abstracts the database structure from applications. A stored procedure can contain almost any command within the T-SQL language. Triggers are created for tables and views and automatically execute in response to an INSERT, UPDATE, or DELETE. Views allow you to assign a name to a SELECT statement that produces a single result set and that is stored within a database.
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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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Cursor DDL trigger Deterministic function DML trigger Distributed partitioned view Event group Execution context Impersonation Indexed view
Programming Microsoft SQL Server with T-SQL User-Defined Stored Procedures, Functions, Triggers, and Views
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Materialized view Module Nondeterministic function Parameter Partitioned view Schema binding Stored procedure Variable
Case Scenario
In the following case scenario, you apply what you ve learned in this chapter. You can find answers to these questions in the Answers section at the end of this book.
Case Scenario: Improving Application Performance
Fabrikam, a large manufacturer and wholesaler of thousands of products for the consumer and industrial plastics industry, has hired you to fix a variety of problems within its core applications. The manager of application development has identified 22 core applications that run Fabrikam s business lines. Users have complained that almost all these applications have slow performance. The application development team has attempted to address the performance issues, but because all the queries are generated at run time and submitted as ad hoc queries to SQL Server, implementing changes has been extremely difficult. Several attempts to release new code have resulted in applications crashing, requiring the code release to be rolled back. The production database servers are configured to allow administrative access to the entire development team. There have been numerous incidents in the past four months where objects have been deleted from the production server instead of the deletion occuring against a development server. There are three applications that all the developers are afraid to modify because the database involved contains very complex code written by a developer who is no longer with the company. No documentation exists for any of the applications. Answer the following questions for your manager:
1. 2. 3.
How do you fix the performance tuning problem How do you fix the problem with accidentally dropping objects on the production database How do you fix the problem of the complex code that is preventing any changes to three core applications
Key Terms
Suggested Practices
To help you master the exam objectives presented in this chapter, complete the following tasks.
Create a Stored Procedure
Practice 1 Locate all the ad hoc SQL within your applications and move the code into stored procedures. Rewrite the application to use the stored procedures.
Create a Function
Practice 1 Locate a block of nontrivial code that performs a calculation or returns a result set but does not modify the state of a database or SQL Server instance. Encapsulate the code in a function so that the code does not have to be re-created each time you need to reference this calculation.
Create a Trigger
Practice 1 Create a DDL trigger to prevent anyone from accidentally dropping objects in your production environment.
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