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School Database: Create a trigger to maintain balance in Student and StudentBackup table. If the user inserted data from the Student then same data in the StudentBackup table should be inserted too.

Question

School Database: Create a trigger to maintain balance in Student and StudentBackup table. If the user inserted data from the Student then same data in the StudentBackup table should be inserted too.

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Solution

To create a trigger in SQL that maintains balance between the Student and StudentBackup tables, you would follow these steps:

  1. First, you need to ensure that the StudentBackup table exists and has the same structure as the Student table. If it doesn't exist, you can create it using a command like this:
CREATE TABLE StudentBackup AS SELECT * FROM Student;
  1. Next, you will create the trigger. This is a stored procedure that is run automatically when a specified event occurs. In this case, the event is an INSERT operation on the Student table. Here's how you can create the trigger:
CREATE TRIGGER backup_student
AFTER INSERT ON Student
FOR EACH ROW
BEGIN
   INSERT INTO StudentBackup VALUES (NEW.id, NEW.name, NEW.grade);
END;

In this trigger:

  • backup_student is the name of the trigger.
  • AFTER INSERT ON Student specifies that the trigger should be run after an INSERT operation on the Student table.
  • FOR EACH ROW means that the trigger should be run for each row that is inserted.
  • BEGIN ... END; contains the SQL commands that should be run when the trigger is activated. In this case, it's an INSERT command that inserts the new data into the StudentBackup table.
  • NEW.id, NEW.name, NEW.grade refers to the values of the new row that was inserted into the Student table. NEW is a keyword that refers to the new row.
  1. Now, every time a new row is inserted into the Student table, the trigger will automatically insert the same data into the StudentBackup table, keeping the two tables in sync.

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