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Discuss content posted by Yousaf Khan
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concatenation
36 posts, Page 4 of 4
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Thomas Abraham
Thomas Abraham
Posted Tuesday, August 21, 2012 11:43 AM
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ronmoses (8/21/2012)
I got it wrong on the assumption that data type conversion would take precedence over concatenation or addition.
Made the same assumption. Since I had never implicitly converted like this, I was under the misapprehension that the datatype evaluation would go before the operations. Thanks to OP for posting, as I learned something today.
Please don't go. The drones need you. They look up to you.
Post #1347992
Raghavendra Mudugal
Raghavendra Mudugal
Posted Wednesday, August 22, 2012 12:03 AM
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Thanks for the good question. :)
wish to see more like this.
(I guess this depends on the initial type of the data which in the first position.
For this "select '130'+'120'+1" it will give you 130121, but for this "select 1+'120'+'130'" it will give you 251 not 121130. It takes the next value and it converts to the first value's data-type and then so on...
select 0 + '130'+'120'+1 - this gives 251 (because the initial value type is number and it works for only int type)
select 0 + '130'+'120'+2.56 - and the decimal works only with the end value.)
ww; Raghu
--
There are only 10 types of people in the world, those who understand binary, and those who don't.
Note: (as of now) only.. 1 and 4 applies (i am on my way...)
Post #1348195
Koen Verbeeck
Koen Verbeeck
Posted Wednesday, August 22, 2012 12:17 AM
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Great question, thanks!
How to post forum questions.
Need an answer? No, you need a question.
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Post #1348198
Andrew Watson-478275
Andrew Watson-478275
Posted Wednesday, August 22, 2012 2:53 AM
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I guess this depends on the initial type of the data which in the first position.
Not entirely true. (Try '130' + 1 + '120' => 251)
If you see the links I posted earlier, the key in this case is datatype precedence. It takes the operands and applies the precedence rules - in this case, the integer takes priority, regardless of whether it's first or second.
http://msdn.microsoft.com/en-us/library/ms190276
(operator precedence)
http://msdn.microsoft.com/en-us/library/ms190309
(data type precedence)
Post #1348257
Rose Bud
Rose Bud
Posted Thursday, August 23, 2012 8:35 AM
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I particularly liked this question because I got it wrong but shouldn't have!
Post #1349152
L' Eomot Inversé
L' Eomot Inversé
Posted Sunday, September 02, 2012 9:00 AM
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Hugo Kornelis (8/21/2012)
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.
+1 - although I've noticed before that people get confused about evaluation order where operators have the same precedence, which probably accounts for some of the "251" answers.
Tom
Is minic a gheibheann béal oscailte dorn dúnta.
Is minig a cheapas beul fosgailte dòrn dùinte.
Post #1353226
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