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Implicit Conversions


Implicit Conversions

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Comments posted to this topic are about the item Implicit Conversions
gbpthomas
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Why 3 marks for this question??
Jeff Moden
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3 Marks isn't bad or good... it means "average" and it is an "Average" question. Tongue

--Jeff Moden

RBAR is pronounced ree-bar and is a Modenism for Row-By-Agonizing-Row.
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Although change is inevitable, change for the better is not.
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I put it as 3 because I think implicit conversions cause a lot of issues, waste time, and I see a lot of questions on these. So it's important.

I may go back and "re-rate" some questions, moving some 1s to 2s and 2s to 3s or 4s, trying to weight them a little more when you have to think. I'll adjust points for correct answers as well if I do.

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Jeff Moden
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I agree... judging from some of the "Why am I getting this error" questions on the forum, implicit conversions to "bite" people a lot. This "simple" question is a very good example of a lot of problems folks have with UNIONs and other places where columnar data is mixed to form a single column.

--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
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Anipaul
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Simple but strong question. We require more this type of questions where you have to 'think' before answering.

Before seeing Jeff's comment 'Average Question' Tongue, I thought it was 'good' question as the marks is '3' not the normal '1'. So I thought more than require. Hehe



Jason Miller-476791
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Perhaps I missed something...


But I believe this works on SQL2000, but 2005.

There was a change to the behavior of unions....
ms-help://MS.SQLCC.v9/MS.SQLSVR.v9.en/instsql9/html/47edefbd-a09b-4087-937a-453cd5c6e061.htm

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I have 2000, and it gave the "correct" result for me.


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William Vach
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This does not work on SQL Server 2005. You get the following error message:
"Msg 245, Level 16, State 1, Line 1
Conversion failed when converting the varchar value 'B' to data type int."
dunnjoe
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That's why I feel answer b is not correct. Answer b says the value is converted to an int. The error message says the conversion failed. So, it appears to be a compilation error.
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