$4.$ Consider the following customer table

a$)$ Write a trigger to insert old values of account number and available balance along with timestamp into mini$\_$statement table before updating any record in customer table

b$)$ Write a trigger to insert new values of account number and available balance along with timestamp into micro$\_$statement table after an update has occurred in customer table.Consider the following customer table

a$)$ Write a trigger to insert old values of account number and available

balance along with timestamp into mini statement table before

updating any record in customer table

b$)$ Write a trigger to insert new values of account number and available

balance along with timestamp into micro statement table after an

update has occurred in customer table.