On 09/06/14 23:42, Vik Fearing wrote:
On 06/09/2014 09:06 AM, Gavin Flower wrote:
 From memory all unique keys can be considered 'candidate primary keys',
but only one can be designated 'the PRIMARY KEY'.
Almost.  Candidate keys are also NOT NULL.
Yeah, obviously!
(Except, I did actually forget that - me bad.)


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