Titlebook: Beginning SQL Queries; From Novice to Profe Clare Churcher Book 2016Latest edition Clare Churcher 2016 SQL.database.database design.databas

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Eine Schlankheitskur für die IVeries will probably be carried out in the blink of an eye. Complicating your life in an attempt to make your queries a little faster does not make a great deal of sense. However, if you have (or might have) vast amounts of data and speed is absolutely critical, you will need more skill and experienc

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Ein Konzept für das IV-Benchmarking all may not be well. In the previous chapter, we looked at the importance of checking the output to confirm that (at least some of) the expected rows are retrieved, as well as checking to make sure that (at least some) incorrect (or irrelevant) rows are not being returned.

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Jose Francisco Sáenz Cogollo,J. BustamanteBefore getting into the nuts and bolts of how to specify queries, we will review some of the ideas and terminology associated with relational databases. We will also look at data models, which are a succinct way of depicting how a particular database is put together; that is, what data is being kept where and how everything is interrelated.

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Eine Schlankheitskur für die IVMost of the examples in this book use the golf club database. Visit the catalog page for this book on the Apress website, look under the Source Code/Downloads tab, and you will find an Access version of this database and also the SQL scripts for creating and populating the tables.

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Controlling verteilter InformationssystemeNo new concepts are presented here that have not been discussed previously—it is just the notation that is different. The more formal notation allows queries to be expressed very concisely, and the underlying mathematics can be useful when dealing with complex situations. We will use the database described in Appendix 1 for the examples.