Optimization on a case of type‐d nested query
作者:
Jiann‐Tsair Chen,
Wei‐Pang Yang,
Meichun Hsu,
期刊:
Journal of the Chinese Institute of Engineers
(Taylor Available online 1988)
卷期:
Volume 11,
issue 3
页码: 309-316
ISSN:0253-3839
年代: 1988
DOI:10.1080/02533839.1988.9677073
出版商: Taylor & Francis Group
关键词: relational database;query languages
数据来源: Taylor
摘要:
Nesting is an important feature in structure query languages (SQL) of the relational database. However, the nesting of query blocks sometimes results in bad performance while evaluating such a query if no effort is contributed to it. A new algorithm to transform a nested query into an equivalent one which is more efficient to process is presented in this paper. The correctness of the transform algorithm is shown as well as the complexity is analyzed in this paper.
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