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Alter Table Subject

The document contains SQL code to modify a database by adding a new column 'DG' to the 'subject' table. It defines two stored procedures: 'FillDGSub', which updates the 'DG' column based on student results, and 'FillSub', which iterates through subjects with 4 credits to execute 'FillDGSub'. The procedures ensure that the 'DG' value reflects whether students have passed or failed based on their marks.

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hunghung654879
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12 views2 pages

Alter Table Subject

The document contains SQL code to modify a database by adding a new column 'DG' to the 'subject' table. It defines two stored procedures: 'FillDGSub', which updates the 'DG' column based on student results, and 'FillSub', which iterates through subjects with 4 credits to execute 'FillDGSub'. The procedures ensure that the 'DG' value reflects whether students have passed or failed based on their marks.

Uploaded by

hunghung654879
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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alter table subject

add DG nvarchar(20)

create proc FillDGSub


@subjectID varchar(50)
as
begin
if (not exists (select * from Subject where ID=@subjectID))
return
declare @sltd int
select @sltd=COUNT(*)
from result r
where r.subjectID=@subjectID
and r.Mark>=5 and r.times > = all
(select r1.times from result r1
where r1.studentID=r.StudentID and
r1.subjectID=r.SubjectID)
if(@sltd>=1)
begin
declare @min float
select @min=MIN(r.mark)
from result r
where r.subjectID=@subjectID
declare @dg nvarchar(20)
if(@min>5)
set @dg = N'đạt'
else
begin
set @dg= N'không đạt'
end
update subject set DG=@dg where ID=@subjectID
end
end
go
create proc FillSub
as
begin
declare c cursor for
(select ID from subject where credit=4)
open c
declare @ID varchar(50)
fetch next from c into @ID
while(@@fetch_status=0)
begin
exec FillDGSub @ID
fetch next from c into @ID
end
close c
deallocate c
end

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