thanks a lot sir. your reply helped me a lot.

but for the delete case, what would you refer?

i want that when the user deletes the data from the table, then it is deleted from the temporary table,and the users would work with the old data itself,

and after half an hour the application would ask that all the deleted data is now to be finally deleted or not? this time if the user presses yes then it would delete the data from the original tables.