String Length

  • Kenneth.Fisher

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    Comments posted to this topic are about the item String Length

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  • Samith C

    Mr or Mrs. 500

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    Nice Question 🙂

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  • rhythmk

    SSCertifiable

    Points: 7162

    Very good question.Refreshed the basics.

    I was not sure about middle two but sure about first two(7,7) and last two(14,80).

    So objective approach which I developed from Engineering Entrance Exam worked and got the right answer 😉

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  • Iulian -207023

    SSCertifiable

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    Nice one , thanks

    Iulian

  • Koen Verbeeck

    SSC Guru

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    Great question, thanks!

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  • paul.knibbs

    SSCoach

    Points: 15270

    I thought the 4th one would be 8 at first, but since 7, 7, 8, 8, 14, 80 wasn't an option had to go by a process of elimination to find the right answer! Slightly odd behaviour from nchar() there, I learned something...

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  • Stuart Davies

    SSCoach

    Points: 18874

    Good question - thanks

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  • Hardy21

    SSCrazy Eights

    Points: 9708

    Nice & Easy

    Thanks

  • Hugo Kornelis

    SSC Guru

    Points: 64645

    paul.knibbs (7/11/2012)


    Slightly odd behaviour from nchar() there, I learned something...

    Hmmm, not sure why you this is strange behaviour for nchar. It is fixed length, so any shorter length string put into it has to be padded. And if you then concatenate another string, it will of course go after the original string (which includes the padding). If you don't want the padding to be in there, use LTRIM() (or use nvarchar instead of nchar, obviously).

    In my opinion, it is LEN() that has the strange behaviour here, because it returns the length of the padded version of the string instead of the length of the string itself. This almost caused me to give the wrong answer - but I recalled just in time the number of times I have already been bitten by this strange behaviour of LEN().

    Thanks for a good question, Kenneth!


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  • paul.knibbs

    SSCoach

    Points: 15270

    Hugo Kornelis (7/11/2012)

    In my opinion, it is LEN() that has the strange behaviour here, because it returns the length of the padded version of the string instead of the length of the string itself.

    Well, it's strange behaviour of LEN() when you provide it with an NCHAR parameter, which is what I sort of meant but failed to express in any comprehensible manner... 🙂

  • (Bob Brown)

    SSCrazy

    Points: 2705

    Great question. Tests some basics that sometimes trips us up.

  • Michael Lysons

    SSCertifiable

    Points: 6472

    Nice one. I learned some new stuff today. 🙂

  • IowaDave

    SSCommitted

    Points: 1601

    Why does datalength of nchar(40) give 80?!?? That really threw me.

    Thanks!

  • paul.knibbs

    SSCoach

    Points: 15270

    IowaDave (7/11/2012)


    Why does datalength of nchar(40) give 80?!?? That really threw me.

    Thanks!

    Because the "n" means the string is Unicode, so it has two bytes per character; DATALENGTH returns the actual length of the storage used for the field. 2 bytes per character * 40 characters = 80 bytes.

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