Understanding Different Types of Triggers in Database Management

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What is a trigger in the context of database management systems?

A set of SQL statements that are called automatically on a database server event (correct)

A parameterized function to modify database tables

A stored procedure that is invoked manually

A type of table in a relational database system

How are triggers different from stored procedures?

Stored procedures are associated with tables

Triggers cannot be automatically called

Stored procedures can receive parameters (correct)

Triggers must be invoked manually

Which statement is true about invoking triggers?

Triggers can only be invoked directly

Triggers are invoked only by rollback commands

Triggers are invoked automatically during data modification events (correct)

Triggers can only be invoked with parameters

What distinguishes a trigger from a stored procedure?

Receiving parameters in triggers Signup and view all the answers

Why is a trigger considered a special procedure?

Because it cannot be invoked directly like a stored procedure Signup and view all the answers

Which of the following accurately describes the role of triggers in database management systems?

Automatically performing actions on specific database events Signup and view all the answers

What will the trigger display_salary_changes show when a record is created in the CUSTOMERS table with the values (7, 'Kriti', 22, 'HP', 7500.00)?

Old salary: New salary: 7500 Salary difference: 500 Signup and view all the answers

What does the UPDATE statement in the text do to the salary of the record with ID = 2 in the CUSTOMERS table?

Adds 500 to the current salary Signup and view all the answers

Which timing point does a Compound Trigger in Oracle support to specify actions?

AFTER STATEMENT – level Signup and view all the answers

What is the purpose of the DROP TRIGGER command in Oracle?

Deletes a trigger Signup and view all the answers

What does a DML operation on the CUSTOMERS table refer to?

Database Modification Language operation Signup and view all the answers

In the INSERT INTO statement provided, what data type is used for the 'SALARY' field?

Float Signup and view all the answers

What is the purpose of a trigger in Oracle?

To execute a set of actions automatically in response to a specific database event Signup and view all the answers

What is the purpose of the 'CREATE TRIGGER' statement in Oracle?

To define a new trigger for the database Signup and view all the answers

Why must the trigger name be unique in Oracle?

To prevent conflicts and ensure each trigger can be identified uniquely Signup and view all the answers

Which keyword is used to specify when a trigger will be executed in Oracle?

WHEN Signup and view all the answers

What type of trigger fires before the specified event has occurred in Oracle?

BEFORE Trigger Signup and view all the answers

Which type of trigger fires for each record affected in a specified event, specifically for DML events?

Row level trigger Signup and view all the answers

What is one of the benefits of triggers mentioned in the text that involves generating derived column values automatically?

Event logging Signup and view all the answers

In the given example, what does the trigger 'sample_trigger' do before an INSERT operation on the 'student' table?

Sets the total column to the marks divided by 6 for the new record Signup and view all the answers

What is the purpose of the trigger 'display_salary_changes' in the provided code snippet?

Display changes in salary when there is a delete operation on the customers table Signup and view all the answers

Which type of trigger fires when a DDL event like CREATE or ALTER is specified?

DDL trigger Signup and view all the answers

What action does the 'display_salary_changes' trigger perform BEFORE DELETE OR INSERT OR UPDATE operations on the customers table?

Calculate and display salary differences for the affected record Signup and view all the answers