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Database Lab_Ch4_Quiz Questions with Solutions 2024
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Database Lab_Ch4_Quiz
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Database Lab_Ch4_QuizWhich of the following keywords must have been included during the creation of a
FOREIGN KEY constraint to allow a row from the parent table to be deleted, even if it is
referenced by a row in the child table - answer ON DELETE CASCADE
Which of the following is a valid statement? - answer “Constraints are rules used to
enforce business rules,
practices, and policies."
Constraints prevent errors by not allowing data to be added to tables
if the data violates specific rules.
Constraints ensure the accuracy and integrity of data.
all of the above
Which of the following are used to enforce business rules? - answer constraints
Which of the following statements about a PRIMARY KEY is incorrect? - answer Each
data value must be unique. XX
In a ""one-to-many"" relationship, which constraint is usually
added to the ""many"" table? - answer FOREIGN KEY
The UNIQUE constraint differs from the PRIMARY KEY constraint
in what way? - answer The UNIQUE constraint allows NULL values.
How can constraints be added to a table? - answer as part of the ALTER TABLE
command XX
Which of the following statements about creating constraints
is incorrect? - answer
Which of the following is the standard abbreviation for the
constraint FOREIGN KEY - answer XX
Which of the following is the standard abbreviation for the constraint NOT NULL? –
answer nn
Which of the following is not a constraint type in Oracle 12c ? - answer REFERENCE
When a constraint is created at the ____ level with the CREATE TABLE command,
the constraint definition is simply included as part of the column definition. -
answerTABLE XX
, The NOT NULL constraint can only be created at the ____ level - answerCOLUMN
If a constraint applies to more than one column, the constraint must be created at the
____ level - answerTABLE
Which of the following statements about creating constraints is incorrect? -
answerWhen you create constraints at the column level, the constraint being created
applies to the column specified XX
If the ____ keyword is included when a constraint is created, a constraint name must be
provided by the user - answerconstraint
Constraints are always enforced at the ____ level. - answerTABLE XX
When a constraint is created at the table level, the constraint definition is provided ____
the column definition list - answerAFTER
Only one ____ constraint can exist for each table. - answerPRIMARY
A PRIMARY KEY constraint can be added to an existing table by using the ____ clause
of the ALTER TABLE command. - answerMODIFY XX
A PRIMARY KEY that consists of more than one column is called a(n) ____ key. -
answerCOMPOSITE
Which view will display the names of all the constraints that you own? -
answerUSER_CONSTRAINTS
What is the syntax for the default constraint name provided by the Oracle 12c server? -
answerSYS_Cn
Which keywords identify a column that, if it contains a value, it must match data
contained in another table - answerFOREIGN KEY
Which of the following types of constraints is used to enforce referential integrity? -
answerFOREIGN KEY
When used with a FOREIGN KEY, the keyword REFERENCES refers to what? -
answerreference integrity
Which of the following statements about the FOREIGN KEY constraint is incorrect? -
answerThe constraint can reference any column in another table, even a column that
has not been designated as the primary key for the referenced table
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