Question
Hello, can someone please solve the folowing question for me ? thanks in advance Consider two E-R models. Model A consists of two entities and
Hello, can someone please solve the folowing question for me ? thanks in advance
Consider two E-R models. Model A consists of two entities and one relationship joining them. The entities are lecturer and course and the relationship is teaches. The second model consists of three entities; the first and the third are the same as above but the second entity is called lecture. The first and second entities are joined by a relationship called gives while the second and the third entities are joined by a relationship called of.
Which two of the following are correct? Briefly justify your answers.
(A) Both models allow a course to have more than one lecture from the same lecturer
(B) Model B is more appropriate if information about all lectures, past and present, is to be stored
(C) Model A does not allow lecture date and time to be stored
(D) Model B leads to more tables than Model A does when translated to the relational model
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