I'm looking for fine grained (row and column level) access control in databases. In other words, I'm looking for mandatory access control (MAC), security policies that classify data and users based on security classes (something like the Bell-LaPadula model).
Oracle has a product, Oracle Label Security that implements powerful multilevel security at row level on Oracle DBMSs. Unfortunately, I was unable to find similar solutions in other databases as MySQL and PostgreSQL.
Any advice?