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RETURN clause, clarification


RETURN clause, clarification

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autoexcrement
Old Hand
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Sorry, this might be my dumbest post yet. But I can't seem to find a simple explanation.

I'm unclear on exactly what "RETURN" does. BoL says it "[immediately] exits unconditionally from a query or procedure."

But then in the context of a UDF, you have to have a RETURN clause, which is followed by stuff that you want to be returned.

So which is it? Does it exit immediately, or does it return stuff that follows it?

And then, to make matters worse for stupid people, there's also "RETURNS"...

Sad


"If I had been drinking out of that toilet, I might have been killed." -Ace Ventura
Jeff Moden
Jeff Moden
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autoexcrement (1/14/2011)
Sorry, this might be my dumbest post yet. But I can't seem to find a simple explanation.

I'm unclear on exactly what "RETURN" does. BoL says it "[immediately] exits unconditionally from a query or procedure."

But then in the context of a UDF, you have to have a RETURN clause, which is followed by stuff that you want to be returned.

So which is it? Does it exit immediately, or does it return stuff that follows it?

And then, to make matters worse for stupid people, there's also "RETURNS"...

Sad


RETURN does both. It exits the current proc and returns to the calling proc or the "system" that called it. If a value follows the RETURN, it also returns that value.

It is not usual to consider it to be an "abort" though because if a sproc is called from another sproc, the RETURN doesn't stop the outer sproc from continuing. It's more like a "RETURN" from GOSUB in BASIC.

--Jeff Moden

RBAR is pronounced ree-bar and is a Modenism for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column.
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autoexcrement
autoexcrement
Old Hand
Old Hand (374 reputation)Old Hand (374 reputation)Old Hand (374 reputation)Old Hand (374 reputation)Old Hand (374 reputation)Old Hand (374 reputation)Old Hand (374 reputation)Old Hand (374 reputation)

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THANK YOU!


"If I had been drinking out of that toilet, I might have been killed." -Ace Ventura
Jeff Moden
Jeff Moden
SSC Guru
SSC Guru (85K reputation)SSC Guru (85K reputation)SSC Guru (85K reputation)SSC Guru (85K reputation)SSC Guru (85K reputation)SSC Guru (85K reputation)SSC Guru (85K reputation)SSC Guru (85K reputation)

Group: General Forum Members
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You bet... thanks for the feedback.

--Jeff Moden

RBAR is pronounced ree-bar and is a Modenism for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column.
If you think its expensive to hire a professional to do the job, wait until you hire an amateur. -- Red Adair

Helpful Links:
How to post code problems
How to post performance problems
Forum FAQs
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