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Oracle Trigger MCQs

Oracle Trigger MCQs: This section contains multiple-choice questions and answers on trigger in Oracle.
Submitted by Anushree Goswami, on June 16, 2022

1. ____ statements against an Oracle table can execute procedures implicitly.

  1. INSERT
  2. UPDATE
  3. DELETE
  4. All of the above

Answer: D) All of the above

Explanation:

INSERT, UPDATE, and DELETE statements against an Oracle table can execute procedures implicitly.

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2. Database triggers are the _____.

  1. Functions
  2. Procedures
  3. Databases
  4. None

Answer: B) Procedures

Explanation:

Database triggers are the procedures.

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3. ___ CREATE TRIGGER statements are present in accordance with their firing points.

  1. Five
  2. Six
  3. Seven
  4. Eight

Answer: B) Six

Explanation:

Six CREATE TRIGGER statements are present in accordance with their firing points.

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4. Which of the following is the FIRING POINT: BEFORE?

  1. BEFORE INSERT TRIGGER
  2. BEFORE UPDATE TRIGGER
  3. BEFORE DELETE TRIGGER
  4. All of the above

Answer: D) All of the above

Explanation:

The following are the FIRINT POINT: BEFORE -

  1. BEFORE INSERT TRIGGER
  2. BEFORE UPDATE TRIGGER
  3. BEFORE DELETE TRIGGER

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5. Which of the following is not the FIRING POINT: AFTER?

  1. AFTER INSERT TRIGGER
  2. AFTER UPDATE TRIGGER
  3. BEFORE DELETE TRIGGER
  4. AFTER DELETE TRIGGER

Answer: C) BEFORE DELETE TRIGGER

Explanation:

BEFORE DELETE TRIGGER is not the FIRING POINT: AFTER.

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6. In Oracle BEFORE INSERT/UPDATE/DELETE trigger statement, Oracle specifies that the trigger will be fired BEFORE _____ operations are executed.

  1. INSERT
  2. UPDATE
  3. DELETE
  4. All of the above

Answer: D) All of the above

Explanation:

In Oracle BEFORE INSERT/UPDATE/DELETE trigger statement, Oracle specifies that the trigger will be fired BEFORE INSERT, UPDATE, or DELETE operations are executed.

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7. What are the parameters in the Oracle BEFORE INSERT/UPDATE/DELETE trigger statement?

  1. OR REPLACE
  2. Trigger_name
  3. Table_name
  4. All of the above

Answer: D) All of the above

Explanation:

The parameters in the Oracle BEFORE INSERT/UPDATE/DELETE trigger statement are OR REPLACE, trigger_name and table_name.

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8. Which of the following is an optional parameter in Oracle BEFORE INSERT/UPDATE/DELETE trigger statement?

  1. Trigger_name
  2. Table_name
  3. OR REPLACE
  4. None

Answer: C) OR REPLACE

Explanation:

OR REPLACE is an optional parameter in Oracle BEFORE INSERT/UPDATE/DELETE trigger statement.

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9. A trigger is re-created by using OR REPLACE if it already exists.

  1. Created
  2. Re-created
  3. Added
  4. Deleted

Answer: B) Re-created

Explanation:

A trigger is re-created by using OR REPLACE if it already exists.

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10. A ____ statement cannot be used to change the trigger definition if the OR REPLACE parameter is specified.

  1. DROP TRIGGER
  2. ADD TRIGGER
  3. REPLACE TRIGGER
  4. None

Answer: A) DROP TRIGGER

Explanation:

A DROP TRIGGER statement cannot be used to change the trigger definition if the OR REPLACE parameter is specified.

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11. The trigger name is specified by ____.

  1. Name
  2. Time
  3. Address
  4. Size

Answer: A) Name

Explanation:

The trigger name is specified by Name.

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12. The ____ triggers will be fired before the INSERT, UPDATE, or DELETE operation.

  1. DELETE
  2. UPDATE
  3. INSERT
  4. All of the above

Answer: D) All of the above

Explanation:

The DELETE, UPDATE, and INSERT triggers will be fired before the INSERT, UPDATE, or DELETE operation.

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13. The trigger operation will be performed on the _____ specified by the table_name parameter.

  1. Table
  2. Field
  3. Row
  4. Column

Answer: A) Table

Explanation:

The trigger operation will be performed on the table specified by the table_name parameter.

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14. Which of the following is the limitation of using BEFORE INSERT/UPDATE/DELETE trigger?

  1. A view cannot have a BEFORE trigger.
  2. The OLD values cannot be updated.
  3. The NEW values are the only ones that can be updated.
  4. All of the above

Answer: D) All of the above

Explanation:

The following are the limitations of using BEFORE INSERT/UPDATE/DELETE trigger -

  1. A view cannot have an BEFORE trigger.
  2. The OLD values cannot be updated.
  3. The NEW values are the only ones that can be updated.

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15. A trigger statement that specifies that Oracle will fire this trigger ____ the INSERT/UPDATE/DELETE operation is executed specifies that the trigger will be fired AFTER these operations are executed.

  1. BEFORE
  2. AFTER
  3. MIDDLE
  4. CENTER

Answer: B) AFTER

Explanation:

A trigger statement that specifies that Oracle will fire this trigger AFTER the INSERT/UPDATE/DELETE operation is executed specifies that the trigger will be fired AFTER these operations are executed.

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16. If you need to remove a trigger from Oracle, use the ____ TRIGGER statement.

  1. DELETE
  2. DROP
  3. REMOVE
  4. None

Answer: B) DROP

Explanation:

If you need to remove a trigger from Oracle, use the DROP TRIGGER statement.

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17. What is/are the parameter in DROP TRIGGER statement?

  1. trigger_name
  2. table_name
  3. Both A and B
  4. None of the above

Answer: A) Trigger_name

Explanation:

The parameter in DROP TRIGGER statement is trigger_name.

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18. What is the syntax of DROP TRIGGER statement?

  1. DROP TRIGGER trigger_name;
  2. DELETE TRIGGER trigger_name;
  3. REMOVE TRIGGER trigger_name;
  4. None

Answer: A) DROP TRIGGER trigger_name;

Explanation:

The syntax of DROP TRIGGER statement is DROP TRIGGER trigger_name;.

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19. A trigger can be disabled using the ____ TRIGGER statement.

  1. DISABLE
  2. ENABLE
  3. ALTER
  4. CHANGE

Answer: C) ALTER

Explanation:

A trigger can be disabled using the ALTER TRIGGER statement.

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20. What is the syntax of DISABLE Trigger?

  1. ALTER TRIGGER trigger_name DISBALE;
  2. ALTER TRIGGER trigger_name ALTER;
  3. DISABLE TRIGGER trigger_name DISABLE;
  4. DISBALE TRIGGER trigger_name ALTER;

Answer: A) ALTER TRIGGER trigger_name DISBALE;

Explanation:

Syntax of DISABLE trigger is ALTER TRIGGER trigger_name DISABLE.

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21. ALTER TRIGGER is used to ____ trigger.

  1. Disable
  2. Enable
  3. Both A and B
  4. None of the above

Answer: C) Both A and B

Explanation:

ALTER TRIGGER is used to Disable and Enable triggers.

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22. What is the syntax of ENABLE Trigger?

  1. ALTER TRIGGER trigger_name ENABLE;
  2. ALTER TRIGGER trigger_name ALTER;
  3. ENABLE TRIGGER trigger_name ENABLE;
  4. ENABLE TRIGGER trigger_name ALTER;

Answer: A) ALTER TRIGGER trigger_name ENABLE;

Explanation:

Syntax of DISABLE trigger is ALTER TRIGGER trigger_name ENABLE.

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