controllers
发表于 2025-3-21 19:45:36
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做事过头
发表于 2025-3-21 21:27:49
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–吃
发表于 2025-3-22 04:25:53
Starting Points for Agency ResearchThis chapter discusses the environment of a database system. The sections in this chapter are as follows.
Malfunction
发表于 2025-3-22 08:10:23
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Pageant
发表于 2025-3-22 08:52:52
Limitations on Syntactic ProcessingIn order to design high quality databases, you need to be cognizant of the fundamental integrity and normalization rules for the database. We will discuss these rules in this chapter. The sections in this chapter include.
政府
发表于 2025-3-22 16:53:12
Arthur Wingfield,Patricia A. TunSome database systems textbooks make much ado about having separate chapters for database modeling and database design. In this course, we will not, and the reason will become clear shortly.
政府
发表于 2025-3-22 19:02:56
The Production and Reproduction of ChildhoodIn relational calculus, we simply specify what data is required, not how to obtain the required relation(s). Relational algebra, on the other hand, provides a collection of explicit operations in SELECT, JOIN, PROJECT etc., which can be used to tell the system how to derive desired relation(s).
enormous
发表于 2025-3-22 23:27:56
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类人猿
发表于 2025-3-23 01:57:24
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我不怕牺牲
发表于 2025-3-23 07:04:28
https://doi.org/10.1007/b138515Two very powerful and important features of SQL are the facility to create and manage logical views, and the capability to manage security issues of a database. This chapter discusses these two related issues.