mysql三表查詢的方法(附圖)
阿新 • • 發佈:2019-02-17
//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