《SQL与关系理论》(SQL and Relational Theory: How to Write Accurate SQL Code )(C.J. Date)清晰版[PDF]
中文名: SQL与关系理论
原名: SQL and Relational Theory: How to Write Accurate SQL Code
作者: C.J. Date
图书分类: 计算机与网络
资源格式: PDF
版本: 清晰版
出版社: O'Reilly Media
书号: 0596523068
发行时间: 2009年
地区: 美国
语言: 英文
简介:
内容简介:
Understanding SQL's underlying theory is the best way to guarantee that your SQL code is correct and your database schema is robust and maintainable. On the other hand, if you're not well versed in the theory, you can fall into several traps. In SQL and Relational Theory, author C.J. Date demonstrates how you can apply relational theory directly to your use of SQL. With numerous examples and clear explanations of the reasoning behind them, you'll learn how to deal with common SQL dilemmas, such as:
Should database access granted be through views instead of base tables?
Nulls in your database are causing you to get wrong answers. Why? What can you do about it?
Could you write an SQL query to find employees who have never been in the same department for more than six months at a time?
SQL supports "quantified comparisons," but they're better avoided. Why? How do you avoid them?
Constraints are crucially important, but most SQL products don't support them properly. What can you do to resolve this situation?
Database theory and practice have evolved since Edgar Codd originally defined the relational model back in 1969. Independent of any SQL products, SQL and Relational Theory draws on decades of research to present the most up-to-date treatment of the material available anywhere. Anyone with a modest to advanced background in SQL will benefit from the many insights in this book.
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