摘要: The notion that computation = controlled deduction was first proposed by Pay Hayes [19] and more recently Bibel [2] Vaughn-Pratt [31]. A similar thesis database systems should be regarded as consisting of a relational component, which defines the logic data, control stores retrieves it, has been successfully argued Codd [10]. Hewitt's argument [20] for programming language PLANNER, though generally an against logic, can also algorithms both components. In this paper we shall explore some useful consequences thesis.