Selecting records in between range and apply validations on it

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I have two fields for dates start date & end date ( say for policy).. I have to select the range in between those dates and does not allow user to enter the date in between that range for the next time..
e.g.:
if user have entered start date as 02/09/2010
and end date as 31/07/2011
then when next time he used to enter start date again for his policy it must not be in previous range..
1.
start date: 05/07/2002
end date : 09/12/2004

2.
start date: 10/12/2005
end date : 16/03/2007

3.
start date: 25/03/2010
end date : 31/07/2011

suppose these are the three records in db..now for the 4th record the range which user going to select must not be in any of previous ranges..so how should i select new range???

Posted 13-Sep-11 0:18am

PrasadKulkarni*7

Updated 13-Sep-11 0:41am

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Herman<T>.Instance 13-Sep-11 6:19am

what is your exact problem?

CodingLover 13-Sep-11 6:26am

So what is your question?

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BobJanova · Answer 1 · 2011-09-13T01:22:00

The simplest solution is just to check whether the proposed range clashes with any of the existing ranges, and reject it if so. Something like

SQL

select id, startdate, enddate from ranges where (@startdate > startdate and @startdate < enddate) or (@enddate > startdate and @enddate < enddate)

@startdate and @enddate are parameters (pulled from the UI) for the proposed new range, startdate and enddate are column names. If any rows are returned then they are ranges which clash with the proposed new one, and you should construct an error message explaining what the clashes are.