this is my problem.
    I have three table
           A, A_B, B

       How Can I get the count of the aA in A_B table?.
      in my application I create a group , and some people join the
group, and I want to get the join number of the group. but i don't
know how to get the number efficient. I just get the group object and
count the number of the record in A_B table
    I know there is a efficient way to tackle the kind of problem in
propel. but I don't know,
could someone give me a short example kindly.

    Another question: how can I get the Bs in a elegant way?..I have
searched the whole site for the problem, but I got nothing :(```  , a
short example will be fine.


  :(..Sorry for my poor English...
regards,
grayblur.


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