//建立tb_borrow與tb_reader間的檢視 
create view tb_viewborreader as
select br.readerid,rd.name
from tb_borrow as br
left join tb_reader as rd on br.readerid=rd.id


 //建立tb_borrow,tb_bookcase與tb_bookinfo間的檢視 
create view tb_viewbookiborrdcase as
select br.bookid,bc.jh
from tb_bookinfo as bi
left join tb_borrow as br on bi.id=br.bookid
join tb_bookcase as bc on bi.jhid=bc.jh


 //建立tb_borrow,tb_bookcase與tb_bookinfo間的檢視 
create view tb_viewbookidborrtype as
select br.bookid,bt.typename
from tb_bookinfo as bi
left join tb_borrow as br on bi.id=br.bookid
join tb_booktype as bt on bi.typeid=bt.id