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 null date

Author  Topic 

helixpoint
Constraint Violating Yak Guru

291 Posts

Posted - 2013-09-05 : 07:24:12
I have a start date and and end date in my table. I want to make sure the dates fall between those 2 date. The end date may be null which means there is no end date. How do I do this.

Dave
Helixpoint Web Development
http://www.helixpoint.com

helixpoint
Constraint Violating Yak Guru

291 Posts

Posted - 2013-09-05 : 08:01:11
I am guessing...

WHERE @date_to_check between rsf.StartDate and Coalesce(@date_to_check, NULL)

Dave
Helixpoint Web Development
http://www.helixpoint.com
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James K
Master Smack Fu Yak Hacker

3873 Posts

Posted - 2013-09-05 : 08:55:02
Couple of questions:

1. When you say you want "dates to fall between those 2 dates", is that inclusive, or exclusive? In other words, if your start date is Sept 1, 2013 and end date is September 5, 2013, how many dates will qualify? 3,4, or 5?

2. If you don't have an end date what should happen? Is any date that is greater (or greater than or equal to) the start date considered to meet the filter criteria?

COALESCE(@date_to_check, NULL) does not seem to be correct. COALESCE function examines each parameter given to it and picks the first one that is not null. So in your case, if @date_to_check is not null, it will pick that. But if it is null, then it will move on to the next one, which happens to be NULL, so it will return null.

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Lamprey
Master Smack Fu Yak Hacker

4614 Posts

Posted - 2013-09-05 : 12:58:45
It is good form to include how you want to handle the comparison. Perhaps sample data a expected output might help to show this sort of thing. But, given the lack of requirements, here is my guess:
WHERE 
rsf.StartDate >= @date_to_check
AND
(
rsf.EndDate <= @date_to_check
OR rsf.EndDate IS NULL
)

-- Or

WHERE
@date_to_check BETWEEN rsf.StartDate AND COALESCE(rsf.EndDate, CAST('9999-12-31' AS DATE))
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