How to disable a trigger name update_salary?

by

ALTER TRIGGER update_salary DISABLE;

In PL/SQL, you can disable a trigger using the following SQL command:

ALTER TRIGGER trigger_name DISABLE;

So, to disable the trigger named update_salary, you would execute:

ALTER TRIGGER update_salary DISABLE;

This statement will prevent the trigger from firing until it is explicitly enabled again using the ENABLE option:

ALTER TRIGGER update_salary ENABLE;

Keep in mind that you may need appropriate privileges to disable or enable triggers.