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Introduction to Database System

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

Oracle
R:base
dBase-II
IDMS

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Introduction to Database System
Which type of entity cannot exist in the database unless another type of entity also exists in the database, but does not require that the identifier of that other entity be included as part of its own identifier?

Weak entity
Strong entity
ID- independent entity
ID-dependent entity

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Introduction to Database System
A command that lets you change one or more fields in a record is

Look-up
All of these
None of these
Insert
Modify

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Introduction to Database System
Any table that meets the definition of a relation is said to be in first normal form.

False
True

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Introduction to Database System
Data security threats include

fraudulent manipulation of data
privacy invasion
all of the listed here
hardware failure

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Introduction to Database System
In SQL, which of the following is not a data Manipulation Language Commands?

DELETE
UPDATE
SELECT
CREATE

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