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Introduction to Database System

Introduction to Database System
The files stored on a secondary stage device are composed of a hierarchy of data. What does a record in a file contain?

Characters
Data field
None of the listed here
Bits

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Introduction to Database System
Which command is used to remove an index from the database in SQL?

ROLL BACK INDEX
DELETE INDEX
DROP INDEX
REMOVE INDEX

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Introduction to Database System
If attribute A determines both attributes B and C, then it is also true that:

B →
C →
A →
(B,C) →

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Introduction to Database System
Which of the following products was the first to implement true relational algebra in a PC DBMS?

R:base
IDMS
dBase-II
Oracle

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Introduction to Database System
A file that is organized in uniform format is formally referred to as a _____ or a database file.

Record
Structured data file
Document
Database
None of these

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Introduction to Database System
A key:

must always be composed of two or more columns.
identifies a column.
can only be one column.
identifies a row.

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