True-False Questions s6

IST 331 Exam 1 Spring 2004 V. Matos

True-False Questions

1. The purpose of a database is to help people keep track of things.

2. Using lists to store data can result in data inconsistency problems.

3. Using lists to store data can result in data deletion problems.

4. Using lists to store data will not result in data addition problems.

5. Breaking a data list into pieces with a single "theme" or purpose is done using a process called table making.

6. A properly constructed database can be described as a list that has been broken up into a group of pieces, each of which is called a table.

7. When a properly constructed database is constructed by breaking a list into an appropriate group of pieces, many of the problems associated with lists are solved.

8. In order to connect the tables in a database, each row in each table must be identified by a table name

9. A column that contains a unique identifier for the rows of its own table is called a key.

10. A column that contains an identifier for the rows of another table in the database is called a global key.

11. It is the job of a program called a database management system to store and retrieve data in the database tables.

12. The industry standard supported by all major DBMSs that allows tables to be joined together is called Sequential Query Language.

13. In a database processing system, a database application interacts with the DBMS.

14. In a database processing system, a database application accesses the database data.

15. In a database processing system, the database application creates queries.

16. In a database processing system, forms are processed by the user.

17. In database processing systems, business users interact directly with database applications, which directly access the database data.

18. In database processing systems, business users interact directly with the DBMS,

1-1 which directly accesses the database data.

19. In database processing systems, business users interact directly with database applications that interact with the DBMS, which directly accesses the database data.

20. In a database processing system, the DBMS processes queries.

21. In a database processing system, rules are processed by the database management system (DBMS).

22. A rule that prevents data from being written in one table unless appropriate related data already exists in another table is called a referential integrity constraint.

23. The description of a database’s structure that is stored within the database itself is called the “metadata.”

24. A database is called “self-describing” because it reduces data duplication.

25. In a database processing system, stored procedures are held by the database management system (DBMS).

26. An index can be used to improve the performance of the database.

27. When the structure of a data entry form or a report is part of a database, it is called application metadata.

28. Multi-user databases are less complicated than single-user databases because the work is distributed to many people.

29. Multi-user databases are more complicated than single-user databases because they must prevent one user’s work from interfering with another’s.

30. Large organizational databases were the first applications of database technology.

Multiple choice

31. Which of the following is a problem of lists that is solved by using a database? a.) data inconsistencies b.) problems adding data c.) problems deleting data d.) missing data e.) All of the above.

32. In order to connect the tables in a database, each row in each table must be identified by a(n) ______. a.) table name b.) column name c.) unique identifier d.) common identifier

1-2 e.) global identifier

33. A column that contains a unique identifier for the rows of its own table is called a(n) ______. a.) joiner b.) relationship c.) key d.) foreign key e.) global key

34. A column that contains an identifier for the rows of another table in the database is called a(n) ______. a.) joiner b.) relationship c.) key d.) foreign key e.) global key

35. A program whose job is to store and retrieve user data in the database is called the ______. a.) Database Modeling System b.) Database Management System c.) Data Business Model System d.) Relational Model Manager e.) Data Business Management Service

36. The industry standard supported by all major DBMSs that allows tables to be joined together is called ______. a.) SQL - Sequential Query Language b.) SQL - Structured Question Language c.) SQL - Structured Query Language d.) RQL - Relational Question Language e.) RQL - Relational Query Language

37. Which of the following are basic components of a database system? a.) the user b.) the database application c.) the database management system (DBMS) d.) the database e.) All of the above.

38. In a database processing system . a.) the database application(s) interact(s) with the DBMS b.) the database application(s) access(es) the database data c.) the DBMS accesses the database data d.) a and b e.) a and c

39. In a database processing system, the database application . a.) creates tables

1-3 b.) creates queries c.) creates reports d.) a and b e.) b and c

40. In a database processing system, forms are processed by . a.) the user b.) the database application c.) the database management system (DBMS) d.) the database e.) All of the above.

True False

41. E-R models are expressed using a single standardized set of universally accepted symbols.

42. A schema is a representation of something of interest to the modeler.

43. An internal schema is a representation of how users view the database.

44. A conceptual schema is a complete logical view of the database.

45. An implementational schema shows physical storage using a particular product or technique.

46. An entity is something in the users’ work environment that the users want to track.

47. Entities of a given type are grouped into entity classes.

48. An entity class is described by the structure of the entities in that class.

49. An entity instance of an entity class is the representation of a particular entity and is described by the values of the attributes of the entity.

50. In E-R modeling, entities within an entity class may have different attributes.

51. In E-R modeling, an attribute may be either composite or multi-value, but it cannot be both.

52. An identifier of an entity instance must consist of one and only one attribute.

53. A “composite identifier” is defined as a composite attribute that is an identifier.

54. An identifier may be either unique or non-unique.

55. E-R modeling recognizes both relationship classes and relationship instances.

56. Relationships do not have attributes.

57. A single relationship class involves only one entity class.

1-4 58. A binary relationship is a relationship based on numerical entity instance identifiers.

59. The degree of a relationship is expressed as the relationship’s maximum cardinality.

60. A relationship’s minimum cardinality indicates whether or not an entity must be involved in the relationship.

61. Relationships among instances of a single entity class are called redundant relationships.

62. A weak entity is an entity that cannot exist in the database without (and is logically dependent upon) another type of entity also existing in the database.

63. ID-dependent entities are a common type of weak entity.

64. All weak entities must have a minimum cardinality of 1 on the entity on which it depends.

65. Multi-value attributes are represented in E-R diagrams by creating a new weak entity to represent the multi-value attribute and creating a 1:N relationship.

66. Subtype entities are used to produce a closer-fitting model when an entity has sets of optional attributes.

67. Entities with an IS-A relationship should have the same identifier.

68. Inheritance in a generalization hierarchy means that the supertype entity inherits all the attributes of the subtype entity.

ORDER CUSTOMER

69. You are given an E-R diagram with two entities, ORDER and CUSTOMER, as shown above, and are asked to draw the relationship between them. If a given customer can place a maximum of many orders and a given order can be placed by at most one customer, which of the following should be indicated in the relationship symbol between the two entities? a.) 0:1 b.) 1:1 c.) 0:N d.) N:1 e.) N:M

70. For a relationship to be considered a binary relationship it must satisfy which of the following conditions? a.) It must involve exactly two entity classes. b.) It must have a maximum cardinality of 1:1. c.) It must have a maximum cardinality of 1:N. d.) Both a and b e.) Both a and c