Quiz Discussion

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

Course Name: SQL -Structured Query Language

  • 1]

    Join

  • 2]

    Projection

  • 3]

    Select

  • 4]

    Union

Solution
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# Quiz
1
Discuss

A domain is atomic if elements of the domain are considered to be ____________ units.

  • 1]

    Different

  • 2]

    Indivisbile

  • 3]

    Constant

  • 4]

    Divisible

Solution
2
Discuss

The ________ clause is used to list the attributes desired in the result of a query.

  • 1]

    Where

  • 2]

    Select

  • 3]

    From

  • 4]

    Distinct

Solution
3
Discuss

Course(course_id,sec_id,semester)

Here the course_id,sec_id and semester are __________ and course is a _________

  • 1]

    Relations, Attribute

  • 2]

    Attributes, Relation

  • 3]

    Tuple, Relation

  • 4]

    Tuple, Attributes

Solution
4
Discuss
SELECT emp_name
FROM department
WHERE dept_name LIKE ’ _____ Computer Science’;

Which one of the following has to be added into the blank to select the dept_name which has Computer Science as its ending string?

  • 1]

    %

  • 2]

    _

  • 3]

    ||

  • 4]

    $

Solution
5
Discuss

In SQL the spaces at the end of the string are removed by _______ function.

  • 1]

    Upper

  • 2]

    String

  • 3]

    Trim

  • 4]

    Lower

Solution
6
Discuss

The tuples of the relations can be of ________ order.

  • 1]

    Any

  • 2]

    Same

  • 3]

    Sorted

  • 4]

    Constant

Solution
7
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
8
Discuss

For each attribute of a relation, there is a set of permitted values, called the ________ of that attribute.

  • 1]

    Domain

  • 2]

    Relation

  • 3]

    Set

  • 4]

    Schema

Solution
9
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
10
Discuss
SELECT * FROM employee WHERE dept_name="Comp Sci";

In the SQL given above there is an error . Identify the error.

  • 1]

    Dept_name

  • 2]

    Employee

  • 3]

    “Comp Sci”

  • 4]

    From

Solution
# Quiz