Re: [HACKERS] Behavior of GENERATED columns per SQL2003

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04-18-2008, 10:01 AM

Tom Lane

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Re: [HACKERS] Behavior of GENERATED columns per SQL2003

Zoltan Boszormenyi <zb@cybertec.at> writes:
> Tom Lane írta:
>> * There is no GENERATED BY DEFAULT AS (expr) in the spec.

> Yes, and because it already exists and called DEFAULT.

No, plain DEFAULT isn't a substitute, because it can't reference the
values of other columns. I think there is a use-case for an overridable
GENERATED expression, but won't press the point right now.

>> Is anyone familiar with a database that implements SQL-spec generated
>> columns? Do they actually store the columns?

> David Fuhry answered this question with the advertised intention.

Yeah, that's good to know --- the text of the spec is quite unhelpful
about telling you what they intended ...

regards, tom lane

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Re: [HACKERS] Behavior of GENERATED columns per SQL2003