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4

______defines the structure of a relation which consists of a fixed set of attribute-domain pairs.

A. Instance

B. Program

C. Schema

D. Super Key

Correct Answer :

C. Schema


Related Questions

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4

Which is the best file organization when data is frequently added or deleted from a file?

A. Sequential

B. Direct

C. Index sequential

D. None of the above

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4

____ table store information about database or about the system.

A. SQL

B. System

C. Nested

D. None of these

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4

The values of the attribute describes a particular

A. Entity set

B. File

C. Entity instance

D. Organization

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4

The collection of information stored in a database at a particular moment is called as ......

A. schema

B. instance of the database

C. data domain

D. independence

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4

Which of the following is not a logical database structure?

A. Chain

B. Network

C. Tree

D. Relational

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4

Which of the following is not a recovery technique?

A. Deferred update

B. Immediate update

C. Two-phase commit

D. Shadow paging

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4

In multiple granularity of locks SIX lock is compatible with

A. IX

B. IS

C. S

D. SIX

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4

______ keyword is used to find the number of values in a column.

A. TOTAL

B. ADD

C. COUNT

D. SUM

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4

Which of the following is not a consequence of concurrent operations?

A. Lost update problem.

B. Update anomaly.

C. Unrepeatable read.

D. Dirty read.

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4

Which of the following aggregate functions does not ignore nulls in its results?.

A. COUNT .

B. COUNT (*)

C. MAX

D. MIN

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4

Tree structures are used to store data in

A. Network model.

B. Relational model.

C. Hierarchical model.

D. File based system.

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4

______is a preferred method for enforcing data integrity

A. Constraints

B. Triggers

C. Stored procedure

D. Cursors

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4

Relational Algebra does not have

A. Selection operator.

B. Projection operator.

C. Aggregation operators.

D. Division operator.

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4

The clause alter table in SQL can be used to

A. add an attribute

B. delete an attribute

C. alter the default values of an attribute

D. all of the above

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4

E-R Modeling is achieved by using ____ diagrams

A. DFD

B. Flowcharts

C. Gantt Charts

D. E-R

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4

A logical schema

A. is the entire database

B. Describes how data is actually stored on disk.

C. is a standard way of organizing information into accessible parts.

D. All of the above

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4

Relational Algebra is

A. Data Definition Language .

B. Meta Language

C. Procedural query Language

D. None of the above

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4

In a relational schema, each tuple is divided into fields called

A. Relations

B. Queries

C. Domains

D. All of the above

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4

In SQL the statement select * from R, S is equivalent to

A. Select * from R natural join S.

B. Select * from R cross join S.

C. Select * from R union join S.

D. Select * from R inner join S.

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4

In SQL, testing whether a subquery is empty is done using

A. DISTINCT

B. UNIQUE

C. NULL

D. EXISTS

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4

An advantage of the database management approach is

A. data redundancy increases

B. data is dependent on programs

C. data is integrated and can be accessed by multiple programs

D. none of the above

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4

A table can have only one

A. Secondary key

B. Alternate key

C. Unique key

D. Primary key

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4

Which of the following relational algebra operations do not require the participating tables to be union-compatible?

A. Union

B. Intersection

C. Difference

D. Join

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4

Which of the following is true for network structure?

A. It is a physical representation of the data.

B. It allows many to many relationship.

C. It is conceptually simple.

D. It will be the dominant database of the future.

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4

For using a specific database …………… command is used.

A. use database

B. database name use

C. Both A & B

D. None of them

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4

In SQL the word natural can be used with

A. inner join

B. full outer join

C. right outer join

D. all of the above

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4

In an E-R, Y is the dominant entity and X is a subordinate entity. Then which of the following is incorrect :

A. Operationally, if Y is deleted, so is X

B. existence is dependent on Y.

C. Operationally, if X is deleted, so is Y.

D. Operationally, if X is deleted, & remains the same.

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4

Which of the following is not a consequence of non-normalized database?

A. Update Anomaly

B. Insertion Anomaly

C. Redundancy

D. Lost update problem

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4

____specifies a search condition for a group or an aggregate.

A. GROUP BY Clause

B. HAVING Clause

C. FROM Clause

D. WHERE Clause

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4

Immediate database modification technique uses

A. Both undo and redo.

B. Undo but no redo.

C. Redo but no undo.

D. Neither undo nor redo.