--根据学生选课题目写一个存储过程，输入教师编号

--判断所教学生的及格率，80分及格，如果及格率超过

--50%，职称上升一级，否则降一级

alter proc pingji

@tno varchar(20)

as

begin

declare @cno varchar(20)

select @cno=cno from Course where Tno=@tno

declare @yxcount int

select @yxcount=count(*) from Score where Cno=@cno and Degree>=70

declare @zcount int

select @zcount=COUNT(*) from Score where Cno=@cno

declare @prof varchar(20)

select @prof=prof from Teacher where Tno=@tno

if @zcount>0

begin

if @yxcount/@zcount>=0.5

begin

if @prof='教授'

begin

print'已经是最高级别，没法再升级了。'

end

if @prof='副教授'

begin

update Teacher set Prof='教授' where Tno=@tno

end

if @prof='讲师'

begin

update Teacher set Prof='副教授' where Tno=@tno

end

if @prof='助教'

begin

update Teacher set Prof='讲师' where Tno=@tno

end

if @prof='后勤'

begin

update Teacher set Prof='助教' where Tno=@tno

end

end

else

begin

if @prof='教授'

begin

update Teacher set Prof='副教授' where Tno=@tno

end

if @prof='副教授'

begin

update Teacher set Prof='讲师' where Tno=@tno

end

if @prof='讲师'

begin

update Teacher set Prof='助教' where Tno=@tno

end

if @prof='助教'

begin

update Teacher set Prof='后勤' where Tno=@tno

end

end

end

else

begin

print'这个老师可能没有教课'

end

end

go

exec pingji '804'