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Run the script in Listing 10-16 to clean up the tables used in this chapter. You can download the script from this book s page at http://www.apress.com. Alternately, you can reinstall the sample databases by following the instructions in the Installing the Sample Databases section in 1.
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CHAPTER 10 WRITING ADVANCED QUERIES
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Listing 10-16. Demo Table Cleanup USE AdventureWorks2008; GO IF OBJECT_ID('dbo.Customers') IS NOT NULL BEGIN DROP TABLE dbo.Customers; END; IF OBJECT_ID('dbo.CustomerHistory') IS NOT NULL BEGIN DROP TABLE dbo.CustomerHistory; END; IF OBJECT_ID('dbo.CustomerSource') IS NOT NULL BEGIN DROP TABLE dbo.CustomerSource; END; IF OBJECT_ID('dbo.CustomerTarget') IS NOT NULL BEGIN DROP TABLE dbo.CustomerTarget; END; IF OBJECT_ID('dbo.Sales') IS NOT NULL BEGIN DROP TABLE dbo.Sales; END;
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Summary
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This chapter covered how to write advanced queries using some exciting new T-SQL features introduced with SQL Server 2005 and 2008. Starting with 4, you saw how CTEs, or common table expressions, can help you solve query problems without resorting to temporary tables or views. In this chapter, you learned several other ways to use CTEs, including how to display hierarchical data with a recursive CTE. With the OUTPUT clause, you can return or store the data involved in data manipulation statements. If you will be involved with loading data warehouses, you can use the MERGE and GROUPING SET features to improve performance. You learned two ways to write pivot queries, using CASE and using the new PIVOT function. You learned about the enhancements to TOP and the exciting new ranking functions. Although the material in this chapter is not required knowledge for beginning T-SQL developers, it will be very beneficial to you to keep these techniques in mind. As you gain more experience, you will often find ways to take advantage of these features.
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CHAPTER 11
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Where to Go Next
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I hope you have enjoyed learning about T-SQL as much as I have enjoyed writing about it. Not everyone is cut out to be a T-SQL developer; it helps to really enjoy writing code. Programming is not something you can just learn and be done with it. You will continue to learn new techniques as long as you are programming T-SQL. The other thing you can count on is that Microsoft will continue to add new features to SQL Server, including new T-SQL features, giving you more to learn about. At the time of this writing, Microsoft has just announced SQL Server 2008 R2 due out in 2010. You may have read this book from cover to cover, typing in all the sample code and performing the exercises found in most of the chapters. If you are like me, you may have just skipped around looking for specific knowledge as you needed it, using the book as a reference. Either way, you would have found simple examples that showed you how to use a specific feature or solve a particular problem. Each chapter used techniques from the previous chapters to solve more complex query problems as the book progressed. I began writing T-SQL queries 12 years ago. I had a book that was about four inches thick on my desk that contained just about everything I needed to know about SQL Server at the time, including TSQL. I remember constantly looking up how to join tables, write aggregate queries, or perform updates until, eventually, I just knew the syntax. As I learned even more techniques, the syntax I knew continued to grow, and the syntax I had to look up constantly changed. Since then, Microsoft has introduced several new versions of SQL Server, expanding the feature set each time. I would probably need four or five books the size of my old reference to cover everything offered with SQL Server today.
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