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RE: Printing Lengths

zymos — Mon, 27 Feb 2012 10:14:11 GMT

Thanks for the question on the data types.

RE: Printing Lengths

hakan.winther — Thu, 11 Aug 2011 00:55:46 GMT

Thanks for the question! Learned something today. I knew about the default length for char/varchar, but not the convert issue. An important sample to show why you shouldn't omit default values or on mandatory statements.

RE: Printing Lengths

Paul White — Sat, 18 Dec 2010 19:38:46 GMT

[quote][b]UMG Developer (12/18/2010)[/b][hr]Will you have forgotten it again because you always specify the length and this isn't an issue? (Unless of course you are working on code written by somebody that doesn't.)[/quote]Yes. If I do have to work on code written by someone that thought it was clever to omit lengths, I always have to look it up to be sure.

RE: Printing Lengths

UMG Developer — Sat, 18 Dec 2010 15:00:42 GMT

[quote][b]SQLkiwi (12/18/2010)[/b][hr]I took a stab at 1,30. So it was 1,*. Ha, very good. I'll have forgotten this again in half an hour, and I still won't care :-D[/quote]Will you have forgotten it again because you always specify the length and this isn't an issue? (Unless of course you are working on code written by somebody that doesn't.)

RE: Printing Lengths

Paul White — Sat, 18 Dec 2010 06:34:52 GMT

I took a stab at 1,30. So it was 1,*. Ha, very good. I'll have forgotten this again in half an hour, and I still won't care :-D

RE: Printing Lengths

michael.kaufmann — Fri, 17 Dec 2010 08:35:28 GMT

Thanks for the question, Rahul.But personally I find the explanation somewhat confusing, specifically the last paragraph where it reads:[quote]It is '*' because when we convert character or binary expressions to an expression of a different data type, data can be truncated, only partially displayed, or an error is returned because the result is too short to display. * means the result length too short to display[/quote]In regards to the default length when n is undefined, it doesn't make a difference whether you use CAST or CONVERT.@length1 prints 1 because no conversion is carried out (varchar = varchar).@length2 prints * because the result (30, due to the conversion from varchar to char) actually is too [b]long[/b] to fit into a column implicitely set to varchar(1) = by not specifying the length in the variable declarartion.Regards,Michael

RE: Printing Lengths

Carlo Romagnano — Tue, 14 Dec 2010 04:10:09 GMT

This is an old kind of COBOL bug:using bad datatype to hold integer:01 IDX PIC 9.PERFORM LBL VARYING IDX BY 1 UNTIL IDX > 10.Endless loop

RE: Printing Lengths

Rahul The Dba — Tue, 14 Dec 2010 01:03:15 GMT

[quote][b]Hardy21 (12/14/2010)[/b][hr]Nice question. Learn something new today...[/quote]thankss

RE: Printing Lengths

Hardy21 — Tue, 14 Dec 2010 00:54:07 GMT

Nice question. Learn something new today...

RE: Printing Lengths

ziangij — Mon, 13 Dec 2010 23:12:38 GMT

good one, thanks Rahul...:-)[code="sql"]declare @myvariable as varchar, @len1 varchar, @len2 varcharset @myvariable = 'hi hello how are you'set @len1 = (select datalength(cast(@myvariable as char)))print @len1set @len1 = (select datalength(cast(@myvariable as varchar)))print @len1set @len2 = (select datalength(convert(char, @myvariable)))print @len2set @len2 = (select datalength(convert(varchar, @myvariable)))print @len2[/code]The above code generates output as[code="plain"]*1*1[/code]difference of char, varchar datatypes...:-)

RE: Printing Lengths

SQLRNNR — Mon, 13 Dec 2010 18:11:03 GMT

Thanks for the question.

RE: Printing Lengths

UMG Developer — Mon, 13 Dec 2010 13:42:52 GMT

Thanks for the interesting question. Though I hope questions like this wouldn't be necessary, and that people would always specify a length on variables to keep themselves out of trouble.

RE: Printing Lengths

SanDroid — Mon, 13 Dec 2010 12:06:14 GMT

[quote][b]Rahul The Dba (12/13/2010)[/b][hr]thanksn i promise i will keep ur words in mind, nxt time i post some questions..[/quote]Rahul,We are not able to tell who these comments are for if you do not post a quoted reply like this one.:cool: Or at the very least include thier name in the post.--------I have.Who has ever been called a "Top Poster"?

RE: Printing Lengths

Toreador — Mon, 13 Dec 2010 10:10:25 GMT

Once again we learn that you should never rely on default datatype precision, but specify it yourself!

RE: Printing Lengths

Rahul The Dba — Mon, 13 Dec 2010 09:11:12 GMT

thanksn i promise i will keep ur words in mind, nxt time i post some questions..

RE: Printing Lengths

Rahul The Dba — Mon, 13 Dec 2010 09:08:57 GMT

that's great ur welcome

RE: Printing Lengths

Rahul The Dba — Mon, 13 Dec 2010 09:07:14 GMT

thanks

RE: Printing Lengths

Rahul The Dba — Mon, 13 Dec 2010 09:06:00 GMT

thanks

RE: Printing Lengths

webrunner — Mon, 13 Dec 2010 07:20:24 GMT

Good question. Taught me something I need to learn.Thanks,webrunner

RE: Printing Lengths

Daniel Bowlin — Mon, 13 Dec 2010 07:00:21 GMT

Inconsistent behavior of SQL Server on the default length. I learned something today. Thanks.

RE: Printing Lengths

Koen Verbeeck — Mon, 13 Dec 2010 05:38:16 GMT

Nice question, although I believe I've seen similar around here (but hey, it can't hurt to refresh things from time to time).Some reference links would have been nice for those who would've wanted to read up on the subject.

RE: Printing Lengths

binli0114 — Mon, 13 Dec 2010 04:12:48 GMT

Thanks a lot for your good question!;-) and i did it right! :w00t:

RE: Printing Lengths

jts_2003 — Mon, 13 Dec 2010 04:11:00 GMT

Thanks for a good question - I hadn't realised there would be a scope problem in this instance so I learnt something new today :-)

RE: Printing Lengths

Rahul The Dba — Sun, 12 Dec 2010 23:49:34 GMT

Thanks..

RE: Printing Lengths

L' Eomot Inversé — Sun, 12 Dec 2010 19:22:34 GMT

Good question. Not sure how I managed to get it wrong, because it's prety straightforward.

RE: Printing Lengths

bitbucket-25253 — Sun, 12 Dec 2010 17:05:38 GMT

[quote][b]Rahul The Dba (12/12/2010)[/b][hr]Hi,All my drear readers hope you will be able to learn a trick about varchar and char datatypes in SQL.Thanks for viewing it.....[/quote]I did and thanks for posting ... was/is a good question

RE: Printing Lengths

Rahul The Dba — Sun, 12 Dec 2010 04:00:25 GMT

Hi,All my drear readers hope you will be able to learn a trick about varchar and char datatypes in SQL.Thanks for viewing it.....

Printing Lengths

Rahul The Dba — Sat, 11 Dec 2010 13:02:51 GMT

Comments posted to this topic are about the item [B]Printing Lengths[/B]