concatenation

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concatenation

Yousaf Khan

Ten Centuries

Points: 1149
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August 20, 2012 at 8:15 pm

#260872

Comments posted to this topic are about the item concatenation
August 21, 2012 at 2:40 am

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Ron McCullough SSC Guru Points: 63877 More actions · Answer 1

Nice question .. good to be reminded of the fundamentals / basic stuff ..

Thanks

If everything seems to be going well, you have obviously overlooked something.

Ron

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Lokesh Vij SSChampion Points: 10836 More actions · Answer 2

Good question:-)

Its always wonderfu to brush up our fundamentals 😀

~ Lokesh Vij

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Prassad Dabbada V R Ten Centuries Points: 1251 More actions · Answer 3

I thought it will conevert everything to int. As the expression eveluates from right to left so from the right first plus will return 121 (120 will be converted to int) and so on and so forth.

but unfortunately my guess is wrong.

Michael Lysons SSCertifiable Points: 6491 More actions · Answer 4

Michael Lysons

SSCertifiable

Points: 6491

August 21, 2012 at 1:33 am

#1527962

Good question. More learning for me.

Andrew Watson-478275 SSCarpal Tunnel Points: 4652 More actions · Answer 5

A good question (which I got wrong :(), but I think that these references better explain what's happening:

http://msdn.microsoft.com/en-us/library/ms190276 (operator precedence)

http://msdn.microsoft.com/en-us/library/ms190309 (data type precedence)

When two operators have the same precedence (as concatenate and add do), then they are evaluated from left to right, so the first plus (concatenate) is done first. When the second plus is evaluated, data type precedence is considered and Int trumps String.

DugyC Hall of Fame Points: 3804 More actions · Answer 6

Yay! I like these questions I can answer in the blink of an eye... now, back to work.

Thanks for today's question 😀

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(Bob Brown) SSCrazy Points: 2705 More actions · Answer 7

(Bob Brown)

SSCrazy

Points: 2705

August 21, 2012 at 4:05 am

#1528013

Good question. Need to remember the basics.

Hugo Kornelis SSC Guru Points: 64790 More actions · Answer 8

A good question. I'll admit that I am surprised at the high number of incorrect answers; I would have expected 70 to 80 percent to get this right.

I'm not surprised that the wrong answers are fairly evenly divided over the wrond answers; they are all very good distractors. Well done!

And Andrew, thank you for providing the links and explanation that really explain the results; they are a good addition to the explanation and references given bij Yousaf.

Hugo Kornelis, SQL Server/Data Platform MVP (2006-2016)
Visit my SQL Server blog: https://sqlserverfast.com/blog/
SQL Server Execution Plan Reference: https://sqlserverfast.com/epr/

gaminik1 Say Hey Kid Points: 705 More actions · Answer 9

Thanks for the question. I ran in to a similar situation while creating a query last week.

sestell1 SSChampion Points: 10230 More actions · Answer 10

Nice question, and a nice example showing that data type issues don't always result in an error. Implicit conversion isn't always your friend.

sknox SSChampion Points: 12388 More actions · Answer 11

Prassad Dabbada V R (8/21/2012)
I thought it will conevert everything to int. As the expression eveluates from right to left so from the right first plus will return 121 (120 will be converted to int) and so on and so forth.
but unfortunately my guess is wrong.

No, expressions evaluate from left to right.

I got it wrong because I'm so used to shortcutting the addition of 3 numbers in my head that I for some reason thought SQL Server could do the same. Too early in the morning, not enough coffee, {{insert additional generic excuse}}.

Error Handler Ten Centuries Points: 1086 More actions · Answer 12

Good question..! I m woundering why almost 50% attempts are wrong.

Best,
Naseer Ahmad
SQL Server DBA

Toreador SSChampion Points: 11365 More actions · Answer 13

sestell1 (8/21/2012)
Implicit conversion isn't always your friend.

Implicit conversion isn't ever your friend!