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from Reader
create view Borrowview (¶ÁÕß±àºÅ,ÊéÃû,×÷Õß,½èÔÄÈÕÆÚ,µ½ÆÚÈÕÆÚ) as
select ReaID,BookName,BookWriter,Outdate,YHdate from Borrow,Book
where Borrow.BookID=Book.BookID and Borrow.Indate is null
create view Historyview (¶ÁÕß±àºÅ,ÊéÃû,½èÔÄÈÕÆÚ,¹é»¹ÈÕÆÚ) as
select ReaID,BookName,Outdate,Indate from Borrow,Book
where Borrow.BookID=Book.BookID and Borrow.Indate is not null
create view Fineview (¶ÁÕß±àºÅ,ÊéÃû,½èÔÄÈÕÆÚ,¹é»¹ÈÕÆÚ,·£¿î,´¦Àí״̬) as
select ReaID,BookName,Outdate,Indate,Fine,CLState from Borrow,Book
where Borrow.BookID=Book.BookID and Fine is not null
create trigger Reader_delete on Reader for delete as
delete Borrow from deleted
where Borrow.ReaID=deleted.ReaID create trigger Borrow_insert1 on Borrow for insert as
declare @BookID char(9) select @BookID=BookID from inserted update Book
set BookState='²»¿É½è' where BookID=@BookID
37
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