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Discuss content posted by Kenneth Fisher
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String Length
43 posts, Page 2 of 5
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String Length
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paul.knibbs
paul.knibbs
Posted Wednesday, July 11, 2012 3:13 AM
Ten Centuries
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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...
Post #1328129
(Bob Brown)
(Bob Brown)
Posted Wednesday, July 11, 2012 4:17 AM
Say Hey Kid
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Great question. Tests some basics that sometimes trips us up.
Post #1328161
Michael Lysons
Michael Lysons
Posted Wednesday, July 11, 2012 5:09 AM
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Nice one. I learned some new stuff today.
Post #1328174
IowaDave
IowaDave
Posted Wednesday, July 11, 2012 6:21 AM
Old Hand
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Why does datalength of nchar(40) give 80?!?? That really threw me.
Thanks!
Post #1328213
paul.knibbs
paul.knibbs
Posted Wednesday, July 11, 2012 6:25 AM
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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.
Post #1328217
KWymore
KWymore
Posted Wednesday, July 11, 2012 6:27 AM
SSCrazy
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IowaDave (7/11/2012)
Why does datalength of nchar(40) give 80?!?? That really threw me.
Thanks!
Because it is the entire length of the string * 2 bytes. Nchar includes padding so the length is 40 versus 7 with nvarchar which does not include padding.
Post #1328221
Dana Medley
Dana Medley
Posted Wednesday, July 11, 2012 6:57 AM
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Thanks for the great question. I was actually brushing up on len() and datalength() just a couple of days ago so it was still really fresh on my brain.
Oh no, we're toast!
I've got this. *Keyboard clatter*
Woah, how'd you do that?
I'm a DBA...Booyah
Yeah, uh huh, you know what it is. Everything I do, I do it big
Post #1328237
DugyC
DugyC
Posted Wednesday, July 11, 2012 7:02 AM
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Great question Kenneth, refreshed the old memory banks there
_____________________________________________________________________
"The difficult tasks we do immediately, the impossible takes a little longer"
Post #1328241
SQLRNNR
SQLRNNR
Posted Wednesday, July 11, 2012 7:20 AM
SSCoach
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thanks for the question.
Jason
AKA CirqueDeSQLeil
I have given a name to my pain...
MCM SQL Server 2008
SQL RNNR
Posting Performance Based Questions - Gail Shaw
Posting Data Etiquette - Jeff Moden
Hidden RBAR - Jeff Moden
VLFs and the Tran Log - Kimberly Tripp
Post #1328260
Divine Flame
Divine Flame
Posted Wednesday, July 11, 2012 7:20 AM
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Good question!
- Divine Flame
Post #1328261
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