Question

How can I use the SQL DATEADD() function to find a record from this business day? For example:

SELECT * FROM records r
WHERE r.creationTime <= GETDATE()
  AND r.creationTime >= DATEADD(dd, -1 * hoursFromStartOfThisDay, GETDATE())

Where ‘hoursFromStartOfThisDay’ is exactly what it says.

Note: I’m talking about business days so from 9am-5pm, Monday-Friday if that matters at all.

Thanks, guys!

Edit: I am also looking to apply a solution to this for the start of the beginning of the week/month and maybe hour too.

Edit: So if a record was created at 18/07/2011 08:55:00 and another created at 18/07/2011 09:05:00, I want the second record to be picked up by the query and not the first. However if the current GETDATE() is 18/07/2011 09:15:00 then it gets tricky.

how about adding AND r.creationTime >= '9am'?

Answer 1

Are you really need a hoursFromStartOfThisDay variable?
If your day is static, from 9 to 5, you can use just this static range:

-- cache current date to avoid multiple calls
DECLARE @startOfADay INT
DECLARE @dayLength INT
DECLARE @currentDate DATETIME
SET @currentDate = DATEADD(dd, 0, DATEDIFF(dd, 0, GETDATE()))
SET @startOfADay = 9
SET @dayLength = 8

SELECT 
   ...
FROM
   ...
WHERE ...
BETWEEN 
      DATEADD(hh, @startOfADay, @currentDate) 
      AND 
      DATEADD(hh, @startOfADay + @dayLength, @currentDate)