Tree-Structure Diagrams The schema for a hierarchical database consists of boxes,which correspond to record types lines,which correspond to links Record types are organized in the form of a rooted tree. No cycles in the underlying graph. Relationships formed in the graph must be such that only one-to-many or one-to-one relationships exist between a parent and a child. Database System Concepts,5th Ed. B.3 ©Silberschat乜，Korth and SudarshanDatabase System Concepts, 5 B.3 ©Silberschatz, Korth and Sudarshan th Ed. Tree-Structure Diagrams The schema for a hierarchical database consists of boxes, which correspond to record types lines, which correspond to links Record types are organized in the form of a rooted tree. No cycles in the underlying graph. Relationships formed in the graph must be such that only one-to-many or one-to-one relationships exist between a parent and a child