Quiz Discussion

‘AS’ clause is used in SQL for

Course Name: SQL -Structured Query Language

  • 1]

    Selection operation

  • 2]

    Rename operation

  • 3]

    Join operation

  • 4]

    Projection operation

Solution
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# Quiz
1
Discuss

Views constructed from SQL SELECT statements that conform to the SQL-92 standard may not contain

  • 1]

    GROUP BY

  • 2]

    WHERE

  • 3]

    ORDER BY

  • 4]

    FROM

Solution
2
Discuss

Which of the following is a legal expression in SQL?

  • 1]
    SELECT NULL FROM EMPLOYEE;

     

  • 2]
    SELECT NAME FROM EMPLOYEE;

     

  • 3]
    SELECT NAME FROM EMPLOYEE WHERE SALARY = NULL;

     

  • 4]
    None of the above

     

Solution
3
Discuss

Which of the following is a comparison operator in SQL?

  • 1]

    =

  • 2]

    LIKE

  • 3]

    BETWEEN

  • 4]

    All of the above

Solution
4
Discuss

Count function in SQL returns the number of

  • 1]

    Values

  • 2]

    Distinct values

  • 3]

    Groups

  • 4]

    Columns

Solution
5
Discuss

To delete a particular column in a relation the command used is

  • 1]

    UPDATE

  • 2]

    DROP

  • 3]

    ALTER

  • 4]

    DELETE

Solution
6
Discuss

What SQL structure is used to limit column values of a table?

  • 1]

    The LIMIT constraint

  • 2]

    The CHECK constraint

  • 3]

    The VALUE constraint

  • 4]

    None of the above

Solution
7
Discuss

A reason for using an SQL view to hide columns is

  • 1]

    to simplify a result only

  • 2]

    to prevent the display of sensitive data only

  • 3]

    to accomplish both of the above

  • 4]

    None of the above

Solution
8
Discuss

Which of the following is an SQL trigger supported by Oracle?

  • 1]

    BEFORE

  • 2]

    AFTER

  • 3]

    INSTEAD OF

  • 4]

    All of the above

Solution
9
Discuss

Which of the following is an advantage of view?

  • 1]

    Data security

  • 2]

    Derived columns

  • 3]

    Hiding of complex queries

  • 4]

    All of the above

Solution
10
Discuss

What is not an advantage of stored procedures?

  • 1]

    Greater security

  • 2]

    SQL can be optimized

  • 3]

    Code sharing

  • 4]

    Increased network traffic

Solution
# Quiz