Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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- I asked this question on Bartleby but didn't get a very clear response, I would like further explaination please. The answer on Bartleby said that it would be none of the options but didn't really explain why. What is the cardinality of the 'writes' relationship type? a) One-to-many b) Many-to-many c) One-to-one d) None of the other options My thought process was that it would be b) Many-to-many since: A person writes many books. And one book is also written by many people. Thus the relationship will be many to many. One to many would mean that one instance is related to many other instances. For example, the address of a house contains many people living in the house. One to one would mean that one instance is associated with only one other instance. For example, one employee will have one unique ID in an organization. So why is the answer none of the other options?arrow_forwardIt is possible to construct a connection such as sec course from a group of relationships that are many to one. Does the relation's many-to-one cardinality restriction get enforced by the main and foreign key constraints? Why do you think that is?arrow_forwardWrite SQL statements to convert the ER diagram (see picture) to table definitions. Capture as many constraints as possible. State the constraints that your translation cannot capture, if any.arrow_forward
- Consider the following prolog database:married (logan, marcia),parent (logan, connor),parent (logan, kendall).parent (logan, roman).parent (logan, siobhan).dating(connor, willa).married(kendall, rava).dating( roman, grace).married(tom, siobhan)parent (caroline, kendall),parent (caroline, roman).parent (caroline, siobhan). Write a prolog rule to identify siblings. The rule sibling/2 receives two argumentsand verifies if they are siblings or not.Two distinct persons are siblings if they have a common parent. A person is not a sibling of self.Example:?- sibling(kendall, roman)true?- sibling(kendall, tom)false?- sibling(kendall, kendall)falsearrow_forwardFor the entity-relationship model expressed in the IE diagram below, what is the minimum number of tables required to implement it in BCNF. (Image attached). Enter the number below.arrow_forwardplease answer the two questions under the second image. Also please include how you knew it was the foreign and primary keyarrow_forward
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