Question

declare @Date DateTime
set @Date='2012-04-16'
select s.sid,'Status'=case a.sid when isnull(a.sid,null)   
then 'absent' else 'present' end from
student s left outer join (select * from absent where date=@Date) as a
on s.sid=a.sid

I have a sql query like this, and I need to create a view with this one…..is it possible..

I created a function for this like

CREATE FUNCTION dbo.Attendance (@Date DateTime)
RETURNS TABLE
AS
RETURN
(
    select s.sid,'Status'=case a.sid when isnull(a.sid,null)   
    then 'absent' else 'present' end from
    student s left outer join (select * from absent where date=@Date) as a
    on s.sid=a.sid

)

the view is created successfully….but when I call the view like

 select * from dbo.Attendance('2012-04-11')

it reports error like “Conversion failed when converting date and/or time from character string.”……how can I call this function

Answer 1

paramerterised views are allowed in MS Access but no serious db server will allow you to construct a view that requires a mandatory parameter.

your example describes a stored procedure which should be the implementation of choice for your requirement.

another way of meeting your requirement would be to keep your @Date parameter in another table, provided it’s there the view can refer to that and will return a row if the criteria is met