Too Many Relationships / Indexes

Apr 21, 2006

Hello
Sorry to add to the number of 'relationship' posts but a thorough search has failed to turn up anything similar to my problem.

I have a table tblSite
Each geographical site (defined by a PK 'SiteNo') in tblSite can contain multiple occurrences of a large number of types of geographical features (ie multiple 1-many relationships).

Eg each Site can contain
100 trees
10 ponds
5 streams
2 springs and so on.

I could have anything up to 50 or so different types of feature that are related on a 1-many basis to the site, linked by 'SiteNo'

Access prevents any more than 32 indexes per table so in practice that means that you can't have more than 32 relationships with referential integrity enforced on any one table. I thought that I was correct in having a separate table for each feature type and creating 1-many relationships to the central table. The fact that I can't have more than a certain number of relationships suggests that my structure is wrong.

I thought about having one large table with a 'feature type' field plus all the other fields required for each feature type but the info recorded about each feature type is different, leading to a large table with many fields, many of which would be blank. This seems to be un-normalized to me.

So, my question is twofold really.
Have I got my structure right? Is it one of those special cases (we all want to be a special case?) and if so, how do I get round it?
If not, where have I gone wrong?
I thought I was comfortable with my design but coming up against this limit has thrown me a bit and I'm not sure how best to proceed.

regards
Neil

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http://i5.photobucket.com/albums/y1...tabledesign.jpg


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