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This method will be exported into the calling class, and allows for counting
of objects using L<SQL::Abstract> format based on fields from the calling
class as well as using fields in classes related through a (chain of) 'has_a'
relationships to the calling class.

=head2 get_deep_where

    my ($what, $from, $where, $bind) = $class->get_deep_where($where, $attr);

This method will be exported into the calling class, and allows for retrieving
SQL fragments used for creating queries.  The parameters are the same as to
deep_search_where.

=head1 AUTHOR

Stepan Riha, C<sriha@cpan.org>

=head1 COPYRIGHT

Copyright (C) 2005, 2007, 2008 Stepan Riha. All rights reserved.