领袖气质
发表于 2025-3-23 11:59:30
,Abkürzungen und Umrechnungstabellen, links are incorporated into the data model as definitions of link operators. Relationships among records are represented directly by the properties of linkage. It will be shown that a link-based data language is at least as powerful as a value-based data language.
后退
发表于 2025-3-23 15:35:52
Graph Data Model, links are incorporated into the data model as definitions of link operators. Relationships among records are represented directly by the properties of linkage. It will be shown that a link-based data language is at least as powerful as a value-based data language.
flimsy
发表于 2025-3-23 19:24:36
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ANTI
发表于 2025-3-23 23:47:27
Bibliothek des Radio Amateurs (geschlossen) higher-level language facility, we have designed a DML on top of the Elementary Data Language. The DML defines rules for composition of Elementary Data Operations. The design goals of DML are summarized as:
伦理学
发表于 2025-3-24 06:08:13
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gentle
发表于 2025-3-24 07:49:57
Graph Data Model, labeled directed graph whose nodes represent records and whose arcs represent links. A query is formulated as an . on the graph. Our data language to express queries is called an .. The operations on the graph are called ., and these include manipulations of both records and links. The semantics of
PAEAN
发表于 2025-3-24 11:05:02
Data Definition Language,ed to define the structure, the integrity constraints and views of a schema. It also supports schema evolution. GDL allows the construction of temporary 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 des
Fibrinogen
发表于 2025-3-24 16:39:53
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antecedence
发表于 2025-3-24 19:23:16
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Perennial长期的
发表于 2025-3-24 23:59:02
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