Subhashish 0 Newbie Poster

I want to write a PL/SQL Stored Procedure. A Project is created in database. Please help me in applying the following logic in stored procedure.
" Project start date and end date are stored in project_date table. Whenever the project start date and end date are amended from oracle forms then my procedure should compare the amended dates with stored dates. After comparing stores the maximum of the start date and end date in a new table project_update database."