Can PL/ SQL expert , can you please help me to write some code for the following function. I will really appreciate your help.I am really having trouble to work it out.   Write  PL/SQL  trigger for Suppose you have table CUSTOMERS with the following fields: customer ID,customer name,credit limit and manager's user name Business rule to implement as a trigger: Only manager who is listed as manager for the particular customer can decrease customer's credit limit.