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RETURN clause, clarification


RETURN clause, clarification

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autoexcrement
autoexcrement
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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.
Although they tell us that they want it real bad, our primary goal is to ensure that we dont actually give it to them that way.
Although change is inevitable, change for the better is not.
Just because you can do something in PowerShell, doesnt mean you should. Wink

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autoexcrement
autoexcrement
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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
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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.
Although they tell us that they want it real bad, our primary goal is to ensure that we dont actually give it to them that way.
Although change is inevitable, change for the better is not.
Just because you can do something in PowerShell, doesnt mean you should. Wink

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