A query language for conceptual models and specification languages of the ''entity-relationship'' type

被引：0
|
作者：
Agafonov, VN [1 ]
机构：
[1] TVER STATE UNIV,TVER 170002,RUSSIA
来源：
PROGRAMMING AND COMPUTER SOFTWARE | 1996年 / 22卷 / 05期
关键词：
D O I：
暂无
中图分类号：
TP31 [计算机软件];
学科分类号：
081202 ; 0835 ;
摘要：
A query language ERQL, which, by the author's intention, is as natural for conceptual models and specification languages of the ''entity-relationship'' type (ER) as the SQL and QUEL query languages are natural for relational data models, is introduced. A language of the local manipulation with entities and relations is determined; it is also natural for ER-models and ER-relations, but on the level of local fragments (neighborhoods) of a net of ''entities-relationships.'' The essential features of the ER-models and ER-languages are formulated in the form of a model of ''entities-relationships'' on which the suggested languages are based.
引用
收藏
页码：250 / 259
页数：10
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