Some thing I've encountered in practically every project in the last 10 years is a large number of calculated attributes that have to be in code or in triggers.

Some thing I've encountered in practically every project in the last 10 years is a large number of calculated attributes that have to be in code or in triggers. I know MySQL and PostgreSQL both have generated/virtual columns but they are in-table only, and this can be accomplished with triggers, but I want to be able to simply define my table schemas based on schemas from other tables, and have the database system handle it automatically.