How do you initialize a variable in a stored procedure with a function - tsql

Question

How do you initialize a variable in a stored procedure with a function?
This doesn't work:
/****** Object: StoredProcedure [dbo].[usp_ShowBackpopGaps] Script Date: 05/25/2011 19:57:23 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
-- =============================================
-- Author: <Author,,Name>
-- Create date: <Create Date,,>
-- Description: <Description,,>
-- =============================================
ALTER PROCEDURE [dbo].[usp_ShowBackpopGaps]
-- Add the parameters for the stored procedure here
#StartDate datetime = DateAdd(yy, -1,getdate()),
#EndDate datetime = getdate
AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON;
-- Insert statements for procedure here
;with dateranges as(
select DateAdd(dd,-1,EtlStartDate) as DateFrom,
DateAdd(dd,1,EtlEndDate) as DateTo
from EtlJobRunStatus
where JobRunStepID like 'ETL[0-9]%' and EndTime is not null
union all
select #StartDate ,#StartDate
union all
select DateAdd(dd,-1,#EndDate),DateAdd(dd,-1,#EndDate)
)
select DateAdd(dd,-1,DateTo) as MissingFrom,
DateAdd(dd,1,NextDateFrom) as MissingTo,
DateDiff(d,DateTo, NextDateFrom) as MissingDays
from (
select distinct DateFrom, DateTo as DateTo,
(select MIN (dateFrom)
from dateranges
where DateTo > D.DateTo
) as NextDateFrom
from dateranges D
) X
where DateTo < NextDateFrom
END
GO

Answer 1

You can't have a function call as a parameter default.
I think you need
CREATE PROCEDURE [dbo].[usp_ShowBackpopGaps]
#StartDate DATETIME = NULL,
#EndDate DATETIME = NULL
AS
BEGIN
SET #StartDate = ISNULL(#StartDate,DATEADD(yy, -1,GETDATE()))
SET #EndDate = ISNULL(#EndDate, GETDATE())
...