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Domains


Domains

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Hugo Kornelis
Hugo Kornelis
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<nitpicking>

Especially in a question in the design and theory category, I'd prefer the answer to use the proper term "attribute" or "column" rather than "field".

</nitpicking>

Otherwise, a good question. I never before realized that the term domain is overloaded like that (though I think I always intinctively chose the right understanding).


Hugo Kornelis, SQL Server MVP
Visit my SQL Server blog: http://sqlblog.com/blogs/hugo_kornelis
vxxSQL
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TinyInt has values 0 - 255 not 0 - 127 !
Lynn Pettis
Lynn Pettis
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True, a tinyint can hold a value between 0 and 255, but the DOMAIN of a specific column defined as a tinyint may be 0 to 127. You can use a constraint to disallow values above 127.

Cool

Cool
Lynn Pettis

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Izak Joubert
Izak Joubert
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A "domain" in database design is much more than just the data range. It is the collective meta-data description of a data object, including attributes such as its data type, length, values, constraints and business rules. SQL server may not fully implement meta-data domains, but explaining a domain as simply a range of values, is a little misleading.


Regards,

Izak Joubert

Lynn Pettis
Lynn Pettis
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True, true, but to say that a tinyint holds values between 0 and 255 not 0 and 127 is also misleading in the context of the question. The given data range in the question establishes part of the domain, in which a tinyint is good chioce for holding those values.

Cool
Lynn Pettis

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SQL Musings from the Desert Fountain Valley SQL (My Mirror Blog)
Iwas Bornready
Iwas Bornready
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Thanks for the question.
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