Tag: Databases MCQs

Which one of the following provides the ability to query information from the database and to insert tuples into, delete tuples from, and modify tuples in the database?

administrator
Which one of the following provides the ability to query information from the database and to insert tuples into, delete tuples from, and modify tuples in the database?
DML(Data Manipulation Langauge)
Explanation: DML performs the change in the values of the relation.
DDL(Data Definition Langauge)
Relational Schema
Query

Which one of the following is used to define the structure of the relation, deleting relations and relating schemas?

administrator
Which one of the following is used to define the structure of the relation, deleting relations and relating schemas?
DDL(Data Definition Langauge)
Explanation: Data Definition language is the language which performs all the operation in defining structure of relation.
DML(Data Manipulation Langauge)
Query
Relational Schema

The _________ provides a set of operations that take one or more relations as input and return a relation as an output.

administrator
The _________ provides a set of operations that take one or more relations as input and return a relation as an output.
Relational algebra
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Scheme diagram
Relation flow
Schematic representation

A ________ is a pictorial depiction of the schema of a database that shows the relations in the database, their attributes, and primary keys and foreign keys.

administrator
A ________ is a pictorial depiction of the schema of a database that shows the relations in the database, their attributes, and primary keys and foreign keys.
Schema diagram
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Relational algebra
Database diagram
Schema flow

The _______ operator takes the results of two queries and returns only rows that appear in both result sets.

administrator
The _______ operator takes the results of two queries and returns only rows that appear in both result sets.
Intersect
WellDone! Your Selected answer is Correct. The union operator gives the result which is the union of two queries and difference is the one where query which is not a part of second query
Projection
Difference
Union

The result which operation contains all pairs of tuples from the two relations, regardless of whether their attribute values match

administrator
The result which operation contains all pairs of tuples from the two relations, regardless of whether their attribute values match
Cartesian product
WellDone! Your Selected answer is Correct. Cartesian product is the multiplication of all the values in the attributes.
Intersection
Set difference
None of the Options are Correct
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