Quiz Discussion

A reason for using an SQL view to hide columns is

Course Name: SQL -Structured Query Language

  • 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
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# Quiz
1
Discuss

Count function in SQL returns the number of

  • 1]

    Values

  • 2]

    Distinct values

  • 3]

    Groups

  • 4]

    Columns

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

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
4
Discuss

Which one of the following is not true for a view

  • 1]

    View is derived from other tables

  • 2]

    View is a virtual table

  • 3]

    A view definition is permanently stored as part of the database

  • 4]

    View never contains derived columns

Solution
5
Discuss

Which of the following is a comparison operator in SQL?

  • 1]

    =

  • 2]

    LIKE

  • 3]

    BETWEEN

  • 4]

    All of the above

Solution
6
Discuss

Which is NOT one of the most common types of SQL CHECK constraints?

  • 1]

    System date

  • 2]

    Range checks

  • 3]

    Lists of values

  • 4]

    Comparing one column value to another within the same table

Solution
7
Discuss

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

  • 1]

    UPDATE

  • 2]

    DROP

  • 3]

    ALTER

  • 4]

    DELETE

Solution
8
Discuss

A report generator is used to

  • 1]

    update files

  • 2]

    print files on paper

  • 3]

    data entry

  • 4]

    delete files

Solution
9
Discuss

Which of the following is a valid SQL type?

  • 1]

    CHARACTER

  • 2]

    NUMERIC

  • 3]

    FLOAT

  • 4]

    All of the above

Solution
10
Discuss

The language which has recently become the defacto standard for interfacing application programs with relational database system is

  • 1]

    Oracle

  • 2]

    SQL

  • 3]

    DBase

  • 4]

    4GL

Solution
# Quiz