Need a how to on a special case for views and view links

I have a typical many-to-many relationship model I'm working on.
Basically, it looks like this:
User 1 -------------< * UserGroupXref *>--------------- 1 Groups
You see this in authentication modules all the time. A user can belong to multiple groups and group can contain multiple users.
My task is to use Business Components to create a form that manages user accounts. This form will consist of a User View (master) and 2 detail views.
The first detail view is a list of groups already assigned to the user. I've already defined a viewlink for this first group and it displays its many-to-many results ok.
The second detail view is a list of groups that are available to be assigned to the user. I was thinking that this detail view should be the product of a MINUS operation driven by a BIND VARIABLE. Being a query based view, I think its query would look something like this:
select group_id, group_short_name, group_long_name
from groups
minus
select xref.group_id group_id , group_short_name, group_long_name
from usergroupxref xref, groups
where xref.user_id = :bind_uid
and groups.group_id = xref.group_id
This introduces a bind variable which raises two questions:
1) Is there a better approach
2) How do you use a friggin bind variable?
Seriously, I noticed that the designer will not let you define a relationship based on a bind variable, which leads me to conclude that you have to pass the value at runtime from whatever client app you're using (SWING, JSF, etc). I really haven't found an example of using bind variables that suites me! Maybe someone can point me in the right direction ...?
Finally I have to add control buttons :
Add Group
Add All
Remove All
Remove Group
Naturally these buttons control the inserts and deletes from the xref table. Does this introduce another updateable view into the app or is it something that the framework somehow handles via the defined associations and what not?
I don't expect anyone to design the form for me, but maybe you can help me at least finish up these view links.
Thanks much!
Edited by: user469715 on Jun 4, 2009 8:51 AM
Edited by: user469715 on Jun 4, 2009 8:52 AM

Did you read the section about bind variables in the ADF Developer Guide:
http://download.oracle.com/docs/cd/E12839_01/web.1111/b31974/bcquerying.htm#CEGDGIJH

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>
Does anyone have a advice on how to build an business case for purchasing partitioning? Is there a good way to demonstrate cost-vs-benefit value?
>
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>
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>
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