Conversion

Question

Conversion

bc_

Hall of Fame

Points: 3111
More actions
October 4, 2008 at 1:32 pm

#193652

Comments posted to this topic are about the item Conversion
[font="Arial Narrow"]bc[/font]

Viewing 13 posts - 1 through 12 (of 12 total)

You must be logged in to reply to this topic. Login to reply

Marius Els Right there with Babe Points: 762 More actions · Answer 1

My answer was correct but my reasoning for getting to the answer seemed to have been incorrect; I thought the error would be generated on printing integer and varchar variables together whereby a convert would be required for the int variable.

But after reading the explanation to the answer and going through the msdn article, I learned something new. 🙂

HanShi SSC-Dedicated Points: 33506 More actions · Answer 2

I thought putting the integer value 500000 into a varchar(5) would result in a string with value '50000' (removed last 0). Now I learned it's resulting in a string with value '*'.

Thanks for letting me learn someting new...:w00t:

** Don't mistake the ‘stupidity of the crowd’ for the ‘wisdom of the group’! **

Marius Els Right there with Babe Points: 762 More actions · Answer 3

HanShi (10/6/2008)
I thought putting the integer value 500000 into a varchar(5) would result in a string with value '50000' (removed last 0). Now I learned it's resulting in a string with value '*'.
Thanks for letting me learn someting new...:w00t:

this was part of my thinking as well, that the value will just be truncated.....

hence i moved on to the following steps and anticipated the error further down the statement list.

webrunner SSC-Dedicated Points: 31711 More actions · Answer 4

Thanks, neat question.

I'm sure this may not work every time, but I used the process of elimination based on the sums provided as answers.

I first assumed that there was no error, and that @first would be 50000 (truncated due to varchar(5)).

That led me to get @number + @first + @second = 500000 + 50000 + 50000 = 600000.

600000 wasn't one of the sums given as an answer, so I figured I should pick the error as my answer. Had 600000 been an available answer choice, I probably would have picked it and gotten the answer wrong.

Just my two cents if you want to make it tougher in the future to guess at the answers.

webrunner

-------------------
A SQL query walks into a bar and sees two tables. He walks up to them and asks, "Can I join you?"
Ref.: http://tkyte.blogspot.com/2009/02/sql-joke.html

StarNamer SSCrazy Eights Points: 8744 More actions · Answer 5

I got thius right because I'd seen this error before, but also think more people would not have picked up the error if 600000 had been offered as an answer, i.e. 500000+'50000'+'50000'.

The other obvious wrong answer would be 500000, i.e. if you assume the truncation occurs to the right i.e. 500000 becomes '00000' (leading '5' dropped) and you then get 500000+'0'+'0'.

I'd be interested to see what logic is supposed to arrive at either 15000 or 150000 since I can't see any obvious way to get either of these.

Derek

Nikhil Shikarkhane Default port Points: 1498 More actions · Answer 6

Nikhil Shikarkhane

Default port

Points: 1498

October 6, 2008 at 2:30 pm

#881335

That was a good one...

bc_ Hall of Fame Points: 3111 More actions · Answer 7

i had a hard time coming up with false answers that would throw the reader off. i thought some might misread 50000 for 500000, and thus 150000 (50000+50000+50000). anyway this was my first attempt at writing a QOD. i hope a few people learned about this "gotcha" that puzzled me when i first came upon it in trying to answer another forum question. thanks

[font="Arial Narrow"]bc[/font]

webrunner SSC-Dedicated Points: 31711 More actions · Answer 8

bc (10/6/2008)
i had a hard time coming up with false answers that would throw the reader off. i thought some might misread 50000 for 500000, and thus 150000 (50000+50000+50000). anyway this was my first attempt at writing a QOD. i hope a few people learned about this "gotcha" that puzzled me when i first came upon it in trying to answer another forum question. thanks

Well, you did catch a few people - about 9% 🙂 - but if you had made one other choices 600000 (or 500000 as Derek suggests above), I'd say you would have caught closer to 25% combined with one of the wrong answers.

Still, you made a great question. You should try posting more of them!

webrunner

-------------------
A SQL query walks into a bar and sees two tables. He walks up to them and asks, "Can I join you?"
Ref.: http://tkyte.blogspot.com/2009/02/sql-joke.html

Marius Els Right there with Babe Points: 762 More actions · Answer 9

Marius Els

Right there with Babe

Points: 762

October 6, 2008 at 10:27 pm

#881428

agreed this was an insightful question, well done!

Preet_S SSCrazy Points: 2184 More actions · Answer 10

Like many who attempted the question, I got the right answer but possibly for the wrong reason. At first, I though truncation and implicit conversion would occur, but as 600,000 was not offered as pointed out by others, it was a simple process of elimination.

I shall have a read of BOL.

Good ques.

StarNamer SSCrazy Eights Points: 8744 More actions · Answer 11

bc (10/6/2008)
i hope a few people learned about this "gotcha" that puzzled me when i first came upon it in trying to answer another forum question. thanks

As I mentioned, I'd already encountered this before, but I too puzzled over it when I first saw it.

Definitely a good question.

Derek

kapil_kk SSC-Insane Points: 21316 More actions · Answer 12

Good one!! 🙂

_______________________________________________________________
To get quick answer follow this link:
http://www.sqlservercentral.com/articles/Best+Practices/61537/