On Wed, Nov 21, 2007 at 12:42:58PM +0100, Bert Wesarg wrote:
> Is there an other 'join' I
> should use for the case, where I only want in one class to get a
> 'addRole' function, but not a 'addPerson' function?

   No. But if you don't need addPerson - just don't call it. add*s are
symmetric, you may call one but not the other. It is up yo you.

> And as a second question, how to get something like a dependency tree?

http://www.onlamp.com/pub/a/onlamp/2004/08/05/hierarchical_sql.html
http://www.codeproject.com/cs/database/Trees_in_SQL_databases.asp
http://www.google.com/search?q=%22hierarchical+SQL%22+OR+%22tree+in+SQL%22+OR+%22trees+in+SQL%22

Oleg.
-- 
     Oleg Broytmann            http://phd.pp.ru/            [EMAIL PROTECTED]
           Programmers don't die, they just GOSUB without RETURN.

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