advanced security

In some case can be useful to connect two field of the table to the owner id field

example:

let say I have a table with fields vendor and buyer

The user some case is buyer and some case is vendor

so with:

users can see rows where owner id field = vendor [size="3"]or[/size] owner id field = buyer

In this way the users can see all data where they are in vendor or buyer
actually I create extra view of the table to do this