Embodiments relate to systems and methods for the enforcement of security profiles in a multi-tenant database. A multi-tenant database can be populated with data from different users or other entities. Different users may enjoy different sets of permissions to access, modify, store, and/or otherwise manipulate sets of data within the database. After authentication, a user's associated set of permissions are retrieved. When data is requested, matching tables or other objects located in the database are identified based on the user's query. Rather than retrieving matching tables or other objects directly, a meta data security engine can check the requesting user's permissions, and apply any filters or restrictions required by those permissions to the data present in the table(s). A substitution can be made of a table-valued function, including any filtered data entries, for the table itself. Flexible and granular data security rules can thereby be applied, transparently to the user.