select 1 from rss_gen_subscrs r,acs_sc_impls a where r.summary_context_id=:summary_context_id and a.impl_name=:impl_name and a.impl_id=r.impl_id select impl_id from acs_sc_impls where impl_name=:impl_name and impl_contract_name='RssGenerationSubscriber' and impl_owner_name=:owner select impl_id from acs_sc_impls where impl_name=:impl_name and impl_contract_name='RssGenerationSubscriber' and impl_owner_name=:owner select subscr_id from rss_gen_subscrs where impl_id=:impl_id and summary_context_id=:summary_context_id