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Re: constraint expression for unique keys

Posted by --CELKO-- on 09/27/45 11:51

>> if i have a table which defines a rule as "combination of two field must be unique", how can I write this in a constraint expression section? <<

CONSTRAINT unique_location UNIQUE (x, y)
>> any good learning links, references, or book recommandations? <<

I recommend buying all of my books :)

 

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