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发表于 2025-3-21 17:58:11 | 显示全部楼层 |阅读模式
书目名称Graph Data Model
编辑Hideko S. Kunii
视频video
图书封面Titlebook: ;
出版日期Book 1990
版次1
doihttps://doi.org/10.1007/978-4-431-68114-4
isbn_softcover978-4-431-68116-8
isbn_ebook978-4-431-68114-4
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Introduction, definition of the data objects and relationships together with the operations on the structures supported in the data language. A data language consists of a data definition language (DDL) that defines the data objects and relationships, and a data manipulation language (DML) that expresses operations on the objects defined in the DDL.
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Walther Wegener F.T.I.,Günter FeierA Graph Data Model (GDM) is proposed as a practical solution to the problems from which other data models suffer. The basic concepts developed in GDM are:
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Die neue Generation von Meßdateninterfacesrithms and establishes the relationships between storage structures, schema states, and query specifications. Yao’s cost model uses accesses to external storage as its cost metric. We have extended Yao’s cost model to include the algorithms necessary for processing queries against GDM.
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Data Definition Language,ry record types and link types that exist only during a single session or run. We say that these objects are .. Volatile record and link types are described in Chap. 4. The record and link types that reside in the database are said to be .. DDL supports definitions of resident record and link types.
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