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Introduction to Database System

Introduction to Database System
Which of the following products was an early implementation of the relational model developed by E.F. Codd of IBM?

R:base
IDMS
dBase-II
DB2

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Introduction to Database System
A scheme describes

None of these
record relationships
All of these
records and files
data elements

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Introduction to Database System
Which command(s) is(are) used to enable/disable/drop an integrity constraint in SQL?

DEFINE TABLE
All of the listed here
ALTER TABLE
MODIFY TABLE

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Introduction to Database System
In a 1:N relationship, the parent is the entity on the one side of the relationship and the child is the entity on the N side of the relationship.

False
True

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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?

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

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Introduction to Database System
In SQL, which command is used to add a column/integrity constraint to a table

ADD COLUMN
INSERT COLUMN
MODIFY TABLE
ALTER TABLE

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