Wang Ke. Efficient Query Processing for Constant-time-maintainable Databases with Embedded Fd’s[J]. Acta Electronica Sinica, 1990, (3): 71-76.DOI:
Efficient Query Processing for Constant-time-maintainable Databases with Embedded Fd’s
摘要
本文将证明整个可恒时维护模式类是关于数据依赖有界的
并给出计算代表实例的X-完全投影的关系代数表达式的构造方法
因而这类模式也非常适合于弱实例理论下的查询处理。
Abstract
The whole class of ctm database schemes with cover embedded fd’s is demonstrated in this paper. A method to construct the relational algebraic expressions for computing the total projections of representative instances is described.