Colin Law wrote:
> There is not a great deal more to say, what else do you want to know?
> 
> Colin

  It's scope that is bothering me. Firstly we can have our rows grouped 
by a foreign key (which seems trivial enough). However, what happens if 
it is a polymorphic reference, i.e. we need to use two columns to select 
a unique row?

  It is very kind of all those people bothering to answer such trivial 
questions as mine. Thank you!
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