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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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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

Using which language can a user request information from a database?

Query

Relational

Structural

Compiler

Discussion

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

In precedence of set operators, the expression is evaluated from

Left to left

Left to right

Right to left

From user specification

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MCQ

A _________ integrity constraint requires that the values appearing in specified attributes of any tuple in the referencing relation also appear in specified attributes of at least one tuple in the referenced relation.

Referential

Referencing

Specific

Primary

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Engineering

General

Medical

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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