how many accelerators are there?
select count ( * ) from web_client_accelerator
what accelerators are not compatible with the browsers?
select * from web_client_accelerator where id not in ( select accelerator_id from accelerator_compatible_browser )
can you tell me how many accelerators are not compatible?
select count ( * ) from web_client_accelerator where id not in ( select accelerator_id from accelerator_compatible_browser )