DBMS Multiple Choice Questions and Answers

61. In an E-R diagram an entity set is represent by a

1. rectangle.
2. ellipse.
3. diamond box.
4. circle.

62. A file manipulation command that extracts some of the records from a file is called

1. SELECT
2. PROJECT
3. JOIN
4. PRODUCT

63. A data manipulation command the combines the records from one or more tables is called

1. SELECT
2. PROJECT
3. JOIN
4. PRODUCT

64. Which of the following is a legal expression in SQL?

1. SELECT NULL FROM EMPLOYEE;
2. SELECT NAME FROM EMPLOYEE;
3. SELECT NAME FROM EMPLOYEE WHERE SALARY = NULL;
4. None of the above

65. AS clause is used in SQL for

1. Selection operation.
2. Rename operation.
3. Join operation.
4. Projection operation.

66. The users who use easy-to-use menu are called

1. Sophisticated end users.
2. Naïve users.
3. Stand-alone users.
4. Casual end users.

67. It is better to use files than a DBMS when there are

1. Stringent real-time requirements.
2. Multiple users wish to access the data.
3. Complex relationships among data.
4. All of the above.

68. An entity set that does not have sufficient attributes to form a primary key is a

1. strong entity set.
2. weak entity set.
3. simple entity set.
4. primary entity set.

69. A DBMS query language is designed to

1. support end users who use English-like commands.
2. support in the development of complex applications software.
3. specify the structure of a database.
4. all of the above.

70. The DBMS language component which can be embedded in a program is

1. The data definition language (DDL).
2. The data manipulation language (DML).
3. The database administrator (DBA).
4. A query language.