关系查询的一种原操作分解方法

ATOMIC OPERATION ORIENTED DECOMPOSITION OF RELATIONAL QUERIES

提出了一种以过滤、消重、排序、归并等关系运算为查询原操作构造关系查询的思想，重点分析了多关系连接、并、交、差、除以及聚合等的分解方法及原操作构成要素．

This paper presents a method of constructing relational queries based on such atomic operations as filtering, duplicate removal, sorting and merging. Much attention has been paid to the decomposition method and analysis of atomic operations of relational join, union, intersection, difference, division, and aggregation.