please answer these multiple choices . and please make sure to be correct . Than

Question

please answer these multiple choices .
and please make sure to be correct .
Thanks

CHAPTER 2: (Multiple Choice) Circle the correct answer (3 each 60 points) 21. A(n) s main function is to help one understand the complexities of the real-world environment. a. node b, entity c, model d. database 22. A(n) is anything about which data are to be collected and stored a, attribute b, entity 23. c, relationship d. constraint world. A(n) represents a particular type of object in the real a. attribute b, entity c, relationship d. node 24. A(n) the equivalent of a field in a file system. b, entity a, attribute c, relationship d constraint 25, A(n) s bidirectional. a, attribute b, entity c, relationship d, constraint 26, A(n) is a restriction placed on the data. a. attribute b, entity c, relationship d. constraint 27, are important because they help to ensure data integrity. a. Attributes b. Entities c. Relationships d. Constraints 28, are normally expressed in the form of rules. a. Attributes b. Entities c. Relationships d. Constraints

Explanation / Answer

21. A(n) (c)model's main function is to help one understand the complexities of the realworld environment.
22. A(n) (b)entity is anything about which data are to be collected and stored.
23. A(n) (b)entity represents a particular type of object in
24. A(n) (a)attribute is the equivalent of a field in a file system.
25.A (c)relationship is bidirectional.
26. A (d)Constraints is a restriction placed on the data.
27. (d)Constraints are important because they help to ensure data integrity.
28. (d)Constraints are normally expressed in the form of rules.
29. Students and classes have a (d) many to many relationship.
30. From a database point of view, the collection of data becomes meaningful only when it reflects properly defined (a) business rules
31. They can serve as a communication tool between the users and designers (c)
32.  A noun in a business rule translates to an (a)entity in the data model.
33. A verb associating two nouns in a business rule translates to a (c)relationship in the data model.
34. In the (a) hierarchical model, the basic logical structure is represented as an upside-down tree.
35. In the (a) hierarchical model, each parent can have many children, but each child has only one parent.
36. The hierarchical data model was developed in the 1960's (a)
37. In the (b) network model, the user perceives the database as a collection of records in 1:M relationships, where each record can have more than one parent.
38.VMS/VSAM is an example of the file system data model (b)
39. Oracle 11g is an example of Xml/Hybrid data Model (d)

40. MySQL is an example of relational data Model (c)


I hope it clarifies. Let me know if there is anything.

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