Database Systems Practice Test 120

View of Data Multiple Choice Questions (MCQ) PDF - 120

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View of Data Questions and Answers PDF Download: Quiz 120

MCQ 596: The abstraction level that describes complex low-level data structures in detail, is

A) Physical level

B) View level

C) Virtual level

D) Logical level

MCQ 597: The third level of abstraction, that simplifies the user interaction to the system is

A) Virtual level

B) Physical level

C) Logical level

D) View level

MCQ 598: An index on an attribute of a relation is a data structure that allows database system to find tuples in relation that have specified value for attribute

A) Efficiently

B) Inefficiently

C) Costly

D) Optimized

MCQ 599: The expression r -s represents a

A) Arity

B) Unity

C) Projection

D) Set-difference

MCQ 600: Declarative DMLS requires a user to specify what data are needed and

A) Specifying how to get data

B) Provides data model

C) Provides Schema

D) Not specifying to get data

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