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3 fields together unique/no duplicates?



 
 
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  #11  
Old September 23rd, 2004, 01:07 PM
Nikos Yannacopoulos
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Tim,

Another idea would be to use a fourth field along the three already in the
PK, to store year of birth... I would hope there would be no twins with the
same name, though first cousins with the same name living in the same
building and born in the same year is always a possibility!!!

HTH,
Nikos

"Tim Ferguson" wrote in message
...
"Nikos Yannacopoulos" wrote in
:

Don't you have something similar in the UK, like an NHS
registration number or something, assigned to a person virtually at
birth?


Yes but...

It is forbidden to use them for linking outside the health
service, even to store them on non-NHS systems

Anyway, nobody knows their number

Anyway, they are not duplicate-free (but what do you expect from
Government IT systems?)...

We also have National Insurance Numbers but they are not widely used
outside the taxation/ employment spheres, for reasons similar to above.

All the best


Tim F



  #12  
Old September 23rd, 2004, 01:12 PM
Lynn Trapp
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We've missed one more possibility: misspellings. Take a look at my surname
and try to guess how many different spellings of it I've seen over the
years, then multiply by ten to be closer! How many records would I get?


g Unfortunately, that is the inevitable problem with every Customer,
Supplier, Member, etc. table on the planet. I don't think anyone has found a
solution to it either...and they probably won't.

--
Lynn Trapp
MS Access MVP
www.ltcomputerdesigns.com
Access Security: www.ltcomputerdesigns.com/Security.htm


  #13  
Old September 23rd, 2004, 05:47 PM
Tim Ferguson
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"Nikos Yannacopoulos" wrote in news:
:

I would hope there would be no twins with the
same name, though first cousins with the same name living in the same
building and born in the same year is always a possibility!!!


Christian & Christine; Francesca and Francis; Jan and Jon; etc.... Please,
just believe it -- names make rotten unique identifiers!

All the best


Tim F

 




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