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MCQ

_____ clause is an additional filter that is applied to the result.

Select

Group-by

Having

Order by

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MCQ

The relational model feature is that there

is no need for primary key data.

is much more data independence than some other database models.

are explicit relationships among records.

are tables with many dimensions.

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MCQ

Find the ID, name, dept name, salary for instructors whose salary is greater than $80,000 .

{t | t ? instructor ? t[salary] > 80000}

? t ? r (Q(t))

{t | ? s ? instructor (t[ID] = s[ID]? s[salary] > 80000)}

None of the mentioned

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MCQ

The intersection operator is used to get the _____ tuples.

Different

Common

All

Repeating

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MCQ

A _____ is a property of the entire relation, rather than of the individual tuples in which each tuple is unique.

Rows

Key

Attribute

Fields

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MCQ

A query in the tuple relational calculus is expressed as:

{t | P() | t}

{P(t) | t }

{t | P(t)}

All of the mentioned

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category More Database Management System Topics

Miscellaneous or General

Relational Algebra

Database Systems

Data Models

The Relational Database Model

Entity Relationship (ER) Modeling

Advanced Data Modeling

Normalization

Structured Query Language (SQL)

Advanced SQL

Database Design

Transaction and Concurrency

Data Warehouses

Database Administration

Mixed

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Community Discussion

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More Database Management System Topics