Re: select null + 0 question

Joe Conway <mail(at)joeconway(dot)com> writes:

> Jean-Christian Imbeault wrote:
> > Shouldn't the sum() and "+" operators behave the same?
>
> No, see SQL99, Section 6.16, General Rules 1.b:
>
> "Otherwise, let TX be the single-column table that is the result of applying
> the <value expression> to each row of T and eliminating null values. If one or
> more null values are eliminated, then a completion condition is raised: warning
> — null value eliminated in set function."
>
> I've never seen a database that emits the required warning, though.

Oracle 8i began doing this. How it's handled is up to your driver, I know
DBD::Oracle changed several times and at least for a while treated it as an
error. I'm not sure what the current state on that is.

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greg