关键词: 关系数据库, 函数依赖, 属性, 相关规则

Abstract: In practical applications，there is a class of relations in which the value of a tuple at an attribute is a relation.Such a relation is called a hybrid one.It is necessary to discuss the functional dependences and the corresponding rules in hybrid relations.This paper firstly gives the formal definitions of hybrid relations，and four types of functional dependences and the corresponding rules in hybrid relations.Then a transformation from a hybrid relation to a common one is given，the difference between the hybrid relation and a common one is given，and an example is given to show how a hybrid relation is used in a hybrid relation for the graduated student management.

Key words: relational databases, functional dependence, attributes, rules