Assume the Branch table contains a column called TotalValue that represents the total price for all books at that branch. Following the style shown in the text, write the code for the following triggers.
a. When inserting a row in the Copy table, add the price to the total value for the appropriate branch.
b. When updating a row in the Copy table, add the difference between the new price and the old price to the total value for the appropriate branch.
c. When deleting a row from the Copy table, subtract the price on the record being deleted from the total value for the appropriate branch.