Question

which of the following statements about data aggregation is (are) true? (check all that apply.) a. a database usually has more than one file. b. a column in a database table contains multiple attributes of an instance of that entity. c. a record usually has more than one field. d. a file usually has more than one database.

Answer 1

In the context of databases, a database usually has more than one file, a column contains a single attribute, not multiple, and a record typically has more than one field. However, a single database file does not usually contain multiple databases.

Step-by-step explanation:

The question pertains to data aggregation in the context of databases. Responses to each statement are as follows:

• A: True. A database usually has more than one file, as it is an organized collection of structured information or data, typically stored electronically in a computer system, where files are often used to separate different tables or types of data.
• B: False. A column in a database table represents a single attribute (not multiple) of all instances of that entity, meaning each column stands for one specific property every record in the table will have.
• C: True. A record, which is a single entry in a database table, usually has more than one field. Fields within a record contain actual data values that correspond to the attributes defined by the columns.
• D: False. A file in the context of databases is typically a container for a single database. It is not common practice nor is it typically possible for one database file to contain multiple databases.