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01.29.2008 at 01:30PM PST, ID: 23120900
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9.6

Looking for the best way to calculate ANY intersection between MS Access date ranges

Asked by fredthered in Microsoft Access Database

Hi all,

I am helping out with an accomodation booking system of sorts. The schema has already been decided upon whereby one or more persons P(x) are accomodated with a particular householder H. Each householder accomodates up to P(n) persons on any one date.

The schema outline is:
--------------------------- Householder entity type -------------------------
HouseholderID Autonumber PK
Householder Text
Address Text
Accomodates Integer (the maximum number of persons that can be accomodated at any one time)
.... other Householder specific attributes.

--------------------------- Person entity type -------------------------
PersonID Autonumber PK
Firstname Text
Surname Text
.... other Householder specific attributes

--------------------------- Householder accomodates person entity relationship type -------------------------
HouseholderID  - composite PK -
PersonID           - composite PK -
StartDate Date
NumberOfDays

What I am looking for is the most efficient way to determine the availability of householders to provide accomodation, such that:

Assuming I want to accomodate a new person P(z) on a particular Date D for N days, I want to query the relationship Householder Inner Join (Householder accomodates person) Inner Join Person so that D+N does not intersect StartDate+NumberOfDays, or if it does, it returns the number of days that each householder could provide ( ranked by available days)
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[+][-]01.29.2008 at 02:03PM PST, ID: 20772812

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Zone: Microsoft Access Database
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Solution Provided By: capricorn1
Participating Experts: 1
Solution Grade: A
 
 
[+][-]01.31.2008 at 01:57AM PST, ID: 20785209

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