I need help with this assignment!

PL/SQL Assignment 4 Notice: before working on these problems, please execute the command set serveroutput on: each time before you start to work on a problem (not a Execute the script files company DB. sql sub-problem) 1 Update trigger a Write a trigger that fires when an employee's salary is pdated The trigger will write a record into a table called SalUpdates. The record should contain the information of SSN, new salary, old salary, and date when the change is made (Hint You need create the table SalUpdates first) b. Test the above trigger by updating the salary of employee with ssn 123456789 to 40000 List the Salpdates to verily the results are correc tables employee and Write a trigger that fires when a command tries to delete some rows from Delete DEPARTMEN: table The trigger will reject the deletion and display the warning information "Eailed operation" to the user. (Tip use the system function a ise application error 2. Trigger