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

The statement in SQL which allows changing the definition of a table is

  • 1]

    Alter

  • 2]

    Update

  • 3]

    Create

  • 4]

    Select

Solution
2
Discuss

Which of the following is correct

  • 1]

    a SQL query automatically eliminates duplicates

  • 2]

    SQL permits attribute names to be repeated in the same relation

  • 3]

    a SQL query will not work if there are no indexes on the relations

  • 4]

    None of these

Solution
3
Discuss

Which of the following is a valid SQL type?

  • 1]

    CHARACTER

  • 2]

    NUMERIC

  • 3]

    FLOAT

  • 4]

    All of the above

Solution
4
Discuss

Which of the following is a comparison operator in SQL?

  • 1]

    =

  • 2]

    LIKE

  • 3]

    BETWEEN

  • 4]

    All of the above

Solution
5
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
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 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
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

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

  • 1]

    BEFORE

  • 2]

    AFTER

  • 3]

    INSTEAD OF

  • 4]

    All of the above

Solution
# Quiz