qr code generator c# What statement(s) and or clauses do you need to use to provide the required functionality in Visual C#

Make QR Code in Visual C# What statement(s) and or clauses do you need to use to provide the required functionality

What statement(s) and or clauses do you need to use to provide the required functionality
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Case Scenario 2: Using Transactions
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You are a database developer for Litware, Inc. Litware has had numerous problems with long wait times and many deadlock situations. The database administrator has collected performance information through perfmon and SQL Server Profiler and has determined that the majority of the problems seem to involve five long-running stored procedures that include transactions. You have been asked to review the stored procedures and make recommendations for improving the locking and blocking concerns. Answer the following question for your manager:
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What types of information should you consider when determining your recommendations
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Suggested Practices
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To help you master the exam objectives presented in this chapter, do all the following practices.
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Modify Data by Using INSERT, UPDATE, and DELETE Statements
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Practice 1
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Write multiple INSERT statements using a variety of options.
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Practice 2 Write UPDATE and DELETE statements, including those based on the results from a joined table.
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Return Data by Using the OUTPUT Clause
Write a variety of statements that make use of both the INSERTED and DELETED tables using the OUTPUT clause.
Practice 3
Suggested Practices
Modify Data by Using MERGE Statements
Practice 4 Write a variety of MERGE statements including those using two definitions for the WHEN NOT MATCHED BY SOURCE THEN <merge_matched> and WHEN MATCHED THEN <merge_matched> statements.
Manage Transactions
Practice 5 Practice working with transactions, including nested transactions, savepoints, and rollbacks. Verify @@trancount and results along each step of the process.
Take a Practice Test
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 70-433 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.
More Info
PracTice TeSTS
For details about all the practice test options available, see the section entitled How to Use the Practice Tests, in the Introduction to this book.
Modifying Data The INSERT, UPDATE, DELETE, and MERGE Statements
cHaPteR 3
Tables, Data Types, and Declarative Data Integrity
he most basic concept of any relational database management system (RDBMS) is the table. However, tables have evolved significantly since the first RDBMS versions. In this chapter, you examine the possibilities and restrictions that exist when designing your tables. The chapter also covers ways of optimizing your table structures and data integrity.
Exam objectives in this chapter:
n n n n
Create and alter tables. Implement data types. Manage international considerations. Create and modify constraints.
Lessons in this chapter:
Lesson 1: Working with Tables and Data Types Lesson 2: Declarative Data Integrity
before You begin
To complete the lessons in this chapter, you must have:
n n n
A basic understanding of Transact-SQL (T-SQL) A good understanding of data types in any programming language Microsoft SQL Server 2008 Developer Edition, Enterprise Edition, or Enterprise Evaluation Edition, and the AdventureWorks sample database installed
real World
Tobias Thernstr m
ithout declarative data integrity, your database can end up in a terrible state. I have seen this too many times when working with clients as a consultant.
It typically starts with queries behaving oddly. As an example, I once visited a client that complained of an order that he knew should exist in the database and that he claimed had been lost. My first instinct was that it probably was lost because of an accidental delete by the client, but when querying the database, sure enough, there was the order. So why wasn t it showing up in the application Simple: the query that fetched the order was joined (using an INNER JOIN) to a customer in the table containing customers, and the customer was missing! Because they didn t have any foreign key constraint declared between the customer and order tables, the customer had been accidentally deleted even though it had existing (and undelivered) orders.
Tables, Data Types, and Declarative Data Integrity
Lesson 1: Working with tables and Data types
Designing, creating, and maintaining tables is one of the most important tasks of a database developer. In this lesson, you walk through these and other tasks related to tables. You also take a look at the data types available in SQL Server 2008.
After this lesson, you will be able to:
n n n
Know the details of the basic data types that are included in SQL Server 2008. Use these data types correctly. Implement declarative data integrity in your tables.
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