A well designed database and mechanism to extract it, is an integral part of software applications. Also business rules are always more safely implemented when these are validated at database level apart from front end. There are many processes/jobs which run in backend and need to process data in defined way. Database functions, procedures, triggers and packages are created to ensure validation or processing of data at the time of any transaction in database table. I am an database expert and will help you in implementing every kind of database solutions.