Titlebook: Beginning SQL Queries; From Novice to Profe Clare Churcher Book 20081st edition Apress 2008 SQL.database.database design.databases.design.l

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F. Warren Burton,W. Ken JacksonIn the previous chapters, you have seen how to use relational algebra operations to combine tables and extract subsets of information. You’ve also seen how to express many different types of queries in terms of the relational calculus and how to translate these to SQL statements using a number of keywords and phrases.

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只看該作者 · 發(fā)表于 2025-3-26 12:44:03

Aggregate Operations,SQL has many functions for manipulating numbers and text. In this chapter, we will look at some of the functions for summarizing data—for example, to count all the senior members in the club—and how to make the best use of them. We will also explore how to group data before doing your aggregates or summaries.

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