A                            constraint requires that an entity belong to no more than one lower- level entity set.

Related MCQs

• If an entity set is a lower-level entity set in more than one ISA relationship, then the entity set has
• Consider the employee work-team example, and assume that certain employees participate in more than one work team. A given employee may therefore appear in more than one of the team entity sets that are lower level entity sets of employee. Thus, the generalization is                            
• An entity in A is associated with at most one entity in B, and an entity in B is associated with at most one entity in A.This is called as
• There are similarities between the instructor entity set and the secretary entity set in the sense that they have several attributes that are conceptually the same across the two entity sets: namely, the identifier, name, and salary attributes. This process is called
• An entity in A is associated with at most one entity in B. An entity in B, however, can be associated with any number (zero or more) of entities in A.
• For a weak entity set to be meaningful, it must be associated with another entity set, called the
• For a weak entity set to be meaningful, it must be associated with another entity set, called the
• Every weak entity set can be converted into a strong entity set by:
• A                    integrity constraint requires that the values appearing in specified attributes of any tuple in the referencing relation also appear in specified attributes of at least one tuple in the referenced relation.
• A _________ integrity constraint requires that the values appearing in specified attributes of any tuple in the referencing relation also appear in specified attributes of at least one tuple in the referenced relation.