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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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Query Data by Using SELECT Statements
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Practice 1 Write and execute a variety of SELECT statements including WHERE clauses using Boolean operators and LIKE and the ORDER BY clause. Review and compare the output from the different statements.
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Practice 1 Write and execute a variety of SELECT statements that include the JOIN operator. Be sure to compare the results of INNER, LEFT or RIGHT OUTER, and FULL OUTER joins. Practice 2 Write and execute a variety of SELECT statements that use the UNION, EXCEPT, INTERSECT, CROSS APPLY, and OUTER APPLY operators.
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Implement Aggregate Queries
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Practice 1 Write and execute a variety of SELECT statements that use aggregate functions with the GROUP BY clause and GROUPING operator.
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Apply Built-in Scalar Functions
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Practice 1 Write and execute a variety of queries that return values from built-in functions including a variety of date and time functions, CAST and CONVERT, REPLACE, LEN and DATALENGTH, PATINDEX, and CHARINDEX.
take a Practice test
The practice tests on this book s companion CD offer many options. For example, you can test yourself on just one exam objective, 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 titled How to Use the Practice Tests, in the Introduction to this book.
Data Retrieval
cHaPteR 2
Modifying Data The INSERT, UPDATE, DELETE, and MERGE Statements
ne of the basic functions required for any database is the ability to add, remove, and modify data. In the SQL programming language, data manipulation language (DML) serves this purpose. The INSERT, UPDATE, and DELETE commands provide you with the ability to manipulate data based on provided input or based on information found elsewhere in the database. In Microsoft SQL Server 2005, the OUTPUT clause was introduced to allow you to return information from each row affected by an INSERT, UPDATE, or DELETE statement. In SQL Server 2008, the MERGE statement was introduced to enhance the ability to perform INSERT, UPDATE, and DELETE statements on a table based on the results of a query to a joined table. These two features add flexibility to your DML statements. To ensure data consistency and reliability, SQL Server provides the ability to execute statements as part of a transaction. A transaction is a group of commands that succeeds or fails as a whole. One of the most referenced examples of a transaction is the transfer of funds from a savings account to a checking account. At a minimum, two steps need to occur: a debit from savings and a credit to checking. A transaction would ensure that if only part of the transaction was completed when the system failed, the entire transaction would return to its initial state.
More info
eRROR HanDLinG
For information about using transactions within stored procedures and about error handling, see 5, Programming Microsoft SQL Server with T-SQL User-Defined Stored Procedures, Functions, Triggers, and Views.
Exam objectives in this chapter:
Modify data by using INSERT, UPDATE, and DELETE statements. Return data by using the OUTPUT clause.
CHAPTER 2 45
Modify data by using MERGE statements. Manage transactions.
Lessons in this chapter:
Lesson 1: Modifying Data by Using INSERT, UPDATE, and DELETE Statements 47 Lesson 2: Enhancing DML Functionality with the OUTPUT Clause and MERGE Statement 58 Lesson 3: Managing Transactions
before You begin
To complete the lessons in this chapter, you must have:
n n n n
A basic understanding of relational database design concepts and terminology A basic understanding of SQL Server data types A general understanding of SELECT statement syntax Knowledge about how SQL Server Management Studio (SSMS) functions. as well as the ability to open new query windows and existing query files from within SSMS SQL Server 2008 Developer Edition, Enterprise Edition, or Enterprise Evaluation Edition, with the AdventureWorks2008 and Northwind sample databases installed
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