Q. Which of the following is not a generalization constraint?

View solution

Q. Condition defined generalization constraint is also said to be ________

View solution

Q. If each higher level entity belongs to the lower level entity, then what kind of generalization is it?

View solution

Q. ________ is an abstraction through which relationships are treated as higher level entities

View solution

Q. Weak entity set is represented as

View solution

Q. If you were collecting and storing information about your music collection, an album would be considered a(n) _____

View solution

Q. What term is used to refer to a specific record in your music database; for instance; information stored about a specific album?

View solution

Q. Let us consider phone_number ,which can take single or several values . Treating phone_numberas an _________ permits instructors to have several phone numbers (including zero) associated with them.

View solution

Q. The total participation by entities is represented in E-R diagram as

View solution

Q. Which of the following is a low level operator?

View solution

Q. A window into a portion of a database is

View solution

Q. The entity set person is classified as student and employee. This process is called _________

View solution

Q. Which relationship is used to represent a specialization entity ?

View solution

Q. The refinement from an initial entity set into successive levels of entity subgroupings represents a ________ design process in which distinctions are made explicit.

View solution

Q. 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

View solution

Q. If an entity set is a lower-level entity set in more than one ISA relationship, then the entity set has

View solution

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

View solution

Q. 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 _____________

View solution

Q. The completeness constraint may be one of the following: Total generalization or specialization , Partial generalization or specialization . Which is the default ?

View solution

Q. Functional dependencies are a generalization of

View solution