Research on canonical cover in partial order temporal scheme
偏序时态模式下规范覆盖问题*

Existing effective design methods of temporal database with multiple time granularities are almost designed for totally-ordered temporal scheme,it can hardly be used for partial-ordered temporal scheme because of complex operations such as greatest lower bound applied to temporal types.This paper investigated canonical cover of partial-order temporal scheme,gave the concepts of partial-order TFD(temporal functional dependency) set limited closure,partial-order scheme attribute set limited closure,partial-or...