碌碌之人
发表于 2025-3-30 10:50:05
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软膏
发表于 2025-3-30 15:07:18
Object Modelling modelling (Blaha . 1988). In this chapter we consider some of the common threads between entity-relationship and objectoriented analysis and discuss some proposals for extending entity-relationship modelling into an object modelling approach.
Mobile
发表于 2025-3-30 19:26:02
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慎重
发表于 2025-3-31 00:46:13
abase systems. The book was developed from the author‘s experiences of running a number of academic and commercial courses on database technology for more than seven years.The text is organised into a number of parts. The introductory chapters set the scene for the core of the text. First, the key f
invert
发表于 2025-3-31 04:43:01
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certitude
发表于 2025-3-31 08:05:09
Nieves Pérez-Solórzano Borragán models. Here, the network and hierarchical data models are also described as being classic in the sense that they formed the basis for the first commercially available DBMS. Although currently relational systems have tended to outstrip network or hierarchical DBMS, a large number of legacy systems still exist running under these approaches.
cortisol
发表于 2025-3-31 12:28:48
The UK Constitution and the European Union relational calculus (section 3.3.11). The current specification of SQL is however much more than simply a query language. It is more accurately described as being a database sublanguage. Indeed, this database sub-language is becoming the standard interface to relational and non-relational DBMS.