As a matter of interest, how many duplicated words do you suggest are acceptable in a table?
For example, if I am writing a Db for a local business or organisation, I know that the same town will appear in the address numerous times, so there are 3 tables for address, towns and counties/states.
If, on the other hand. the Db is for a more national organisation, then I tend to include the town & county as fields in the address table.
So the question is, in the later case, how many duplicate towns is sensible. I tend to limit it to about half a dozen, but would be interested in the Experts views.
Phil
4 1057 twinnyfo 3,653
Recognized Expert Moderator Specialist
Phil,
Although your question is off topic, the topic of the question seems on topic. I aim to never have duplicates, if at all possible. In your example, I would have a table for “People” and a table for “Addresses ”. This would allow you to have Personal, Work and alternate addresses (as many as you like) for each person. In the Addresses table, I would have separate tables for each street name, city and state. Some would have a separate table for “Street Type” such as “Street”, “Road”, “Avenue”, etc.
I hope this makes sense.
Definitely off topic. I'd be more than happy if this could me moved to a new topic.
Phil
Thanks, Twinnyfo for moving this to a new topic, very sensible and much appreciated.
Interesting. I tend to allow a short 0.5% duplicates and a maximum of about 10 duplicates for a large address table before I consider adding the town & county table. Don't think I have ever got to that sort of limit with street names.
I tend to use a lot of join tables - they certainly give great flexibility. as you say, so many learners get the idea of an AddressID in their People Table, then realise that there is a business address so add AddressID, and curse when the find out about the holiday home.
I am trying to write a beginners guide to database design and in particular a bit about normalisation, because so many of the Dbs we see on Bytes are just hopeless. Do you think this would be of any use?
Phil
twinnyfo 3,653
Recognized Expert Moderator Specialist
Absolutely a great idea. There is an article on Bytes that talks about normalization but it speaks very theoretically and might not be as straightforward as a beginner might need. I’d be glad to take a look at your ideas!
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