Question

I use C# .NET

I need run auto datetime in my project and save in SQL Server

Exam.

In SQL Server

Datetime    | workDate
-------------------------
25-10-2012  | work
26-10-2012  | work
28-10-2012  | work

In my project, I’m searching datetime between 25-28

I need program output

25-10-2012  work
26-10-2012  work
27-10-2012  null
28-10-2012  work

But now I get:

25-10-2012  work
26-10-2012  work
28-10-2012  work

Because my data save status work only when status don’t work it’s not save in database.

How can I use insert value null, show data to my project and save in SQL Server?

Thanks For your Time :).

Answer 1

You could use a recursive CTE to generate a list of days.

; with  AllDays as
        (
        select  cast('2012-10-25' as date) as dt -- Start date
        union all
        select  dateadd(day, 1, dt)
        from    AllDays
        where   dt < '2012-10-28' -- End date
        )
select  convert(varchar(10), ad.dt, 105)
,       workDate
from    AllDays ad
left join
        Table1 t1
on      t1.Datetime = convert(varchar(10), ad.dt, 105)

Example at SQL FiIddle. The convert changes the SQL Server date to a varchar(10) in format 105, the Italian format.