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[ProgSoc] NULL values in primary keys in MySQL



 I understand it's bad design, and I get that what I probably want
 is a unique key rather than a primary one, and I get that I should
 read up (again) on normalisation, and I'm well aware that NULL
 != NULL  ... but all that aside (and AFAIK that all *is* an aside)
 what's the logical, or even technical reason for why you can't have
 a primary key that contains columns that may contain a NULL entry?

 Jedd.


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