Using computed field module in drupal
In a situation where you want to process a cck field or do some sort of calculation before storing it in the database, the computed field module is the solution. With computed fields, you can define values in a php code making use of any field in drupal and storing them in the database or just computing them on the fly. In other to use this module, you would need to have some knowledge of php, as it is mainly for developers. In this screencast, we would also be making use of the computed field tools to recompute fields for already created nodes without having to resave all the nodes.