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5 Review
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Case Scenario 2: Banking Corporation
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Northwind Partners is a new banking organization in the southeastern United States. The firm has decided to write its own custom back-end software for running most of its business. Because the software deals with financial data, it is imperative that errors do not affect data modifications. Should an error occur, any modification already made should be backed out, and the error should be logged. An important part of the application will be used by the bank s customer service department when creating new accounts. The customer service agents need to be able to search by name or parts of addresses and find whether the customer has a preexisting account. Because the agents sometimes make typos, and the bank wants to reduce the probability of mistakes, the system must do its best to match existing data, even if it s slightly different than what was typed in. 1. Northwind Partners needs to write code to transfer funds between accounts. How can this code be written to ensure that data modifications can be backed out in the event of a problem 2. How can Northwind Partners make sure that all errors that occur are logged 3. How should the search functionality be written so that slight differences in input text still match the correct preexisting customer data
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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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Writing Queries Against the Sales Schema of the AdventureWorks Database
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For this task, write the following queries in order to practice using various query techniques.
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Practice 1
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Write a query that uses an aggregate function to return the total sales per customer from the SalesOrderHeader table.
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5 Review
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Practice 2
Rewrite the query from Practice 1 to return customers names along with the aggregated data. Make sure that customers who have not made purchases are also included in the output results.
Practice 3
Rewrite the query from Practice 2 as many different ways as you can, making sure that it always returns the same results. Try using different combinations of subqueries and join types. You can store the results of different queries you come up with in temporary tables so that you can verify that the results are the same.
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 70-431 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.
MORE INFO
Practice tests
For details about all the practice test options available, see the section titled How to Use the Practice Tests in this book s Introduction.
6
Creating Partitions
Microsoft SQL Server 2005 introduces a new functionality called partitioning. Partitioning lets you split a table across multiple storage units called filegroups, based on a user specification. Database administrators (DBAs) have been able to separate tables and even indexes onto specific filegroups since SQL Server 7.0, so what is so important about partitions By using partitions, you can place a subset of a table or index on a designated filegroup. This capability lets you separate specific pieces of a table or index onto individual filegroups and effectively manage file input/output (I/O) for volatile tables. Additionally, as organizations collect more and more data and keep it longer for analysis purposes, tables continue to grow larger and larger. Managing such massive tables can be difficult. With partitioning, however, you can segregate data within a table based on age, which lets you target backups at only a subset of a table. The final and most important reason for partitions is that they enable you to easily manage archival routines and data-loading operations. To partition a table or index, you perform the following tasks: 1. 2. 3. Create a partition function. Create a partition scheme mapped to a partition function. Create the table or index on the partition scheme.
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