Quiz Discussion

The term attribute refers to a ___________ of a table.

Course Name: SQL -Structured Query Language

  • 1]

    Record

  • 2]

    Column

  • 3]

    Tuple

  • 4]

    Key

Solution
No Solution Present Yet

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# Quiz
1
Discuss

The most commonly used operation in relational algebra for projecting a set of tuple from a relation is

  • 1]

    Join

  • 2]

    Projection

  • 3]

    Select

  • 4]

    Union

Solution
2
Discuss

The tuples of the relations can be of ________ order.

  • 1]

    Any

  • 2]

    Same

  • 3]

    Sorted

  • 4]

    Constant

Solution
3
Discuss
SELECT name ____ instructor name, course id
FROM instructor, teaches
WHERE instructor.ID= teaches.ID;

Which keyword must be used here to rename the field name?

  • 1]

    From

  • 2]

    Rename

  • 3]

    As

  • 4]

    Join

Solution
4
Discuss

The term _______ is used to refer to a row.

  • 1]

    Attribute

  • 2]

    Tuple

  • 3]

    Field

  • 4]

    Instance

Solution
5
Discuss

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

  • 1]

    Schematic representation

  • 2]

    Relational algebra

  • 3]

    Scheme diagram

  • 4]

    Relation flow

Solution
6
Discuss
SELECT name
FROM instructor
WHERE salary <= 100000 AND salary >= 90000;

This query can be replaced by which of the following ?

  • 1]
    SELECT name
    FROM instructor
    WHERE salary BETWEEN 90000 AND 100000;

     

  • 2]
    SELECT name
    FROM employee
    WHERE salary <= 90000 AND salary>=100000;

     

  • 3]
    SELECT name
    FROM employee
    WHERE salary BETWEEN 90000 AND 100000;

     

  • 4]
    SELECT name
    FROM instructor
    WHERE salary BETWEEN 100000 AND 90000;

     

Solution
7
Discuss

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

  • 1]

    Join

  • 2]

    Cartesian product

  • 3]

    Intersection

  • 4]

    Set difference

Solution
8
Discuss

A ________ in a table represents a relationship among a set of values.

  • 1]

    Column

  • 2]

    Key

  • 3]

    Row

  • 4]

    Entry

Solution
9
Discuss

Department (dept name, building, budget) and Employee (employee_id, name, dept name, salary)
Here the dept_name attribute appears in both the relations. Here using common attributes in relation schema is one way of relating ___________ relations.

  • 1]

    Attributes of common

  • 2]

    Tuple of common

  • 3]

    Tuple of distinct

  • 4]

    Attributes of distinct

Solution
10
Discuss

Student(ID, name, dept name, tot_cred)
In this query which attributes form the primary key?

  • 1]

    Name

  • 2]

    Dept

  • 3]

    Tot_cred

  • 4]

    ID

Solution
# Quiz