HalloweenWeed's answer is correct if you have Windows-based logins (local or site domain) but not if you have your own login that doesn't go through Windows facilities.
i had a table had every user with its password and security level ( admin , user , viewer ) every security level had its own permission in the data base
HalloweenWeed's answer is correct if you have Windows-based logins (local or site domain) but not if you have your own login that doesn't go through Windows facilities.