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Difference Between Two Dates Stored Procedure SQL

Posted on 2009-05-18
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Last Modified: 2012-05-07
Hi

I am trying to do my first stored procedure in SQL Server Management 2005 Express. I basically want to take two dates from a table of batch numbers and calculate the time span between the two dates. (The dates will be the first and last datetime that the batch number was recorded in table).

I have my code so far, but it does not compile - throwing incorrect syntax error on the line:

set @firstdate = SELECT top 1 datetimecol from Test_01.Table_1 where batchcol = @batchnumber order by datetimecol ASC

Even then I am not sure I am going the correct route. any hints / opinions would be appreciated.

Cheers

Neil Whitley
SET ANSI_NULLS ON

GO

SET QUOTED_IDENTIFIER ON

GO

-- =============================================

-- Author:		<Author,,Name>

-- Create date: <Create Date,,>

-- Description:	<Description,,>

-- =============================================

CREATE PROCEDURE TimeDifferenceSecs 

	-- Add the parameters for the stored procedure here

	@batchnumber int = 99, 

	@vessel varchar(50) = "??",

	@firstdate as datetime,

	@lastdate as datetime,

	@difference as datetime

AS

BEGIN

	-- SET NOCOUNT ON added to prevent extra result sets from

	-- interfering with SELECT statements.

	SET NOCOUNT ON;
 

    -- Insert statements for procedure here

	set @firstdate = SELECT top 1 datetimecol from Test_01.Table_1 where batchcol = @batchnumber order by datetimecol ASC
 

	set @lastdate = SELECT top 1 datetimecol from Test_01.Table_1 where batchcol = @batchnumber order by datetimecol DES
 

	set @difference = Datediff("s",@firstdate,@lastdate)
 

END

GO

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Comment
Question by:silchester
  • 2
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4 Comments
 
LVL 60

Accepted Solution

by:
chapmandew earned 500 total points
ID: 24412553
i would do this instead

select datediff(s, min(datetimecol), max(datetimecol))
from test_01.dbo.table_1
where batchcol = @batchcol
0
 

Author Comment

by:silchester
ID: 24412770
Cheers :-) But a stupid question now is how the hell do I run this and see results? I have executed it but there are no results to be seen; I have set SQL to output results to grid, but do not even see a grid?

Sorry for the stupid question.

Neil
0
 
LVL 60

Expert Comment

by:chapmandew
ID: 24412795
you'll need to call the procedure and pass parameters to it.

http://www.sql-server-performance.com/articles/dba/stored_procedures_basics_p1.aspx
0
 

Author Closing Comment

by:silchester
ID: 31582633
Thanks for that - have sorted the results grid query too.
0

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