Quiz Discussion

Which of the following is a legal expression in SQL?

Course Name: SQL -Structured Query Language

  • 1]
    SELECT NULL FROM EMPLOYEE;

     

  • 2]
    SELECT NAME FROM EMPLOYEE;

     

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

     

  • 4]
    None of the above

     

Solution
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# Quiz
1
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
2
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
3
Discuss

The SQL ALTER statement can be used to

  • 1]

    Change the table structure

  • 2]

    Change the table data

  • 3]

    Add rows to the table

  • 4]

    Delete rows from the table

Solution
4
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
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

Which of the following is a comparison operator in SQL?

  • 1]

    =

  • 2]

    LIKE

  • 3]

    BETWEEN

  • 4]

    All of the above

Solution
7
Discuss

What is an advantage of placing computations in SQL views

  • 1]

    To save users from having to write an expression

  • 2]

    To ensure that the results are consistent

  • 3]

    To accomplish both of the above

  • 4]

    None of the above

Solution
8
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
9
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
10
Discuss

Count function in SQL returns the number of

  • 1]

    Values

  • 2]

    Distinct values

  • 3]

    Groups

  • 4]

    Columns

Solution
# Quiz