Re: A Not Join

L van der Walt wrote:
> I have three table:
> Users - Contains username, ID etc...
> Permissions - A permission name and ID
> Link up table - The user.id and permission.id
>
> If a user.id and a permission.id row exists in the linkuptable the user
> have that permission granted.
>
> With the statement below I can see the permissions a user have.
>
> SELECT users.username, permissions.name
> FROM users INNER JOIN linkuptable
> ON (users.id = linkuptable.userid)
> INNER JOIN permissions
> ON (permissions.id = linkuptable.permissionid)
> WHERE users.username = 'DummyUser'
>
> How do I see the permissions that user DON'T have with a fast SQL
> statement.
>
> Thus, a NOT the statement for the above SQL statement
>
> Regards
>
> Lani
>

what you need to do is select all possible permissions and then remove the
permissions that exist. try somthing like:

SELECT permissions.name
FROM permissions.name
WHERE permission.permissionid NOT IN
( SELECT permissions.permissionid
FROM users INNER JOIN linkuptable
ON (users.id = linkuptable.userid)
INNER JOIN permissions
ON (permissions.id = linkuptable.permissionid)
WHERE users.username = 'DummyUser'
)