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10.31.2004 at 03:19PM PST, ID: 21189598
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referential integrity from table a to b

Asked by majorwoo in Microsoft Access Database

Tags: access, referential, integrity

OK, not much of an access person so this could be really easy.

Table a is a list of airports, table b is a list of flights.
A flight has a departure airport, and an arrival airport.

table: airports
(primary key): apt_id

table: flights
(primary key): flt_id
attribute: dep_apt
attribute: arr_apt

I've already set it such that when you enter the arrival/departure airport it's a lookup from the airports table - but what I am trying to do is establish referential integrity on both relationships.  
If I create the first, and establish referential integrity it works just fine, but when I create the second - access creates a second table (airports_1) for the new link(but it does establish referential integrity).  
If I add them to the same link I am unable to enforce referential integrity receiving the standard check that your key is unique error.

I can create a link from airports.apt_id to flights.dep_apt and establish ref. integrity just fine.
I can create a link from airports.apt_id to flights.arr_apt and extablish ref. integrity just fine.
It's only mad when I want both at the same time, where does this leave me?Start Free Trial
[+][-]10.31.2004 at 03:36PM PST, ID: 12459338

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[+][-]10.31.2004 at 03:43PM PST, ID: 12459371

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[+][-]10.31.2004 at 04:26PM PST, ID: 12459782

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About this solution

Zone: Microsoft Access Database
Tags: access, referential, integrity
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Solution Provided By: Data-Man
Participating Experts: 2
Solution Grade: A
 
 
[+][-]10.31.2004 at 04:31PM PST, ID: 12459849

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