Varchar/nvarchar Length

Mar 9, 2007

Hi,

I have a pretty straightforward question to do with variable length fields I hope someone can help me with:

When using varchar (or nvarchar), is there any point in specifying a smaller length than the maximum? Does it save space or improve performance at all?

Thanks
R

edit: I suppose the max rowsize is an issue. any others?

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What Matter Are There If I Always Set Big Length In Nvarchar Field?

Sep 29, 2006

There are two fieldsA1 nvarchar(30)A2 nvarchar(800)I know nvarchar field is alterable length, if I store a string mystring='abc' to A1 field or to A2 field, I think they use the same disk space, so I think it's always a good way to define a big length nvarchar field such as A3 nvarchar(4000) for any length string, becuase they always use the same disk space, is it right?

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Jun 13, 2007

Hi,
I am using SQLSERVER2000.
When storing data in to database ,it is taking/storing only 255 characters for all the datatypes like nvarchar,nchar,char,ntext,text, etc...
I need to increase the maximum length of a field which takes 1000 characters & more.
I already increased the field length to 2000, but it is taking/storing only 255 characters.
Please help me in this................
 
 

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Jul 12, 2004

i have problem regarding the row length and varchar.
my problem is on every new row i have +6 more character on one of my field then the last record. and BOL says i can only have 8060 character per row.
What i can not use the full lenght of varchar(8000) on field.

Can anybody help?????????

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String Or Binary Data Would Be Truncated // Is There A Maximum Length For Passing An Nvarchar Max To A Function?

Mar 18, 2008

I'm running into this error message when passing in a few records in particular to a function, the only difference I could find is that these recods have about 60k characters on the field that I'm passing to a function.

is there a max lenght for passing to a function?

select function ( field) as results

It's been working fine until today and all of the related fields are declared as nvarchar(max)

Thank you.

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Aug 28, 2007

i have used nvarchar as my datatype in sql server 2000 now
i have decided to change to varchar as i can increase the character length from 4000 to 8000
Do I Lose data if i change the datatype.

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Jul 10, 2003

I have a table using nvarchar(for what ever reason which beyond me why its a nvarchar...) that I would like to change to a varchar. There is no unicode in the fields so I don't have to worry about but I don't want to lose any text data. Will coverting the data type lose data?

Thanks

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May 16, 2006

So I have an existing table that looks like:


ID BIGINT
VAL VARCHAR(128)


I am converting this table to something that will be multi language compliant. My question is, I know that NVARCHAR's take double the space of a VARCHAR. Do I actually need to double the length of the VAL field to store the same amount of data or does the DB handle that?

Basically I want to store a 128 character NVARCHAR.. do I need to set my table up like this:


ID BIGINT
VAL NVARCHAR(256)

or


ID BIGINT
VAL NVARCHAR(128)

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Feb 26, 2007

Hi,I am new to MS SQL. When I create a column in a table, when shall Iuse nvarchar or varchar? Please help.Thanks,Mike

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Dec 18, 2006

from the definition, i know that "n" means uni-code. but what is the exact advantage of having nchar or nvarchar over char or varchar?

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Feb 6, 2002

Newbie question:

Why bother specifing the length in varchar()?
Why not just specify the max and not worry about truncation?

Thanks,

Martin

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Length Of Varchar In SQL7.0

May 2, 2000

Hi,
I am trying to insert text into a varchar(5000) column from a JAVA program. I am using MSDE database (which I believe is a strip down version of SQL7.0), with a variation of ms SQL Server 3.70.06.90 ODBC driver and tds jdbc driver from inet software. With the ODBC driver, I don't get any error but the data saved is only 255 characters. With the latter driver, I get a data truncation error and nothing is saved.

Any help is appreciated.

Thanks

- Sharma

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Nov 21, 2000

What is the max field length in SQL Server 7.0 that a varchar field can be?
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Thanks

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Aug 21, 2007



Hi all,

a simple question to ask for varchar type. I want to update a varchar type parameter to a stored procedure to update a table. My question is , if I don't specify the length. and the varchar type will be trimmed to only 1 character. I thought it's supposed to be 50 by default? Besides if I need to compare varchar values, do I need to specify length as well? Cheers.

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Nvarchar And Varchar Sizes....

Jun 19, 2004

Hello again everyone....

I have another question for everyone....

I am currently cleaning up my database to get its total size down and am not sure how nvarchar and varchar work exactly.

When defining the length of a varchar or nvarchar in enterprise manager, will that effect the size of the entry (as far as data size) no matter what the length of the entry? In other words, will there be a difference in Data Size for an entry with the length of 4 characters with a definition of varchar(4) versus an entry with the length of 4 characters with a definition of varchar(50).

****If there is no difference, is there any reason in trying to best guess the size to give nvarchar or varchar columns? It would seem easier to just define the lengths of columns which need variable lengths to 200 or 400 just to save time in not trying to best guess what the size might be...*****

Thanks ahead for any help...

-Alec

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Aug 4, 2006

Hi,

Can someone please explain to me how the datapages in Microsoft SQL Server 2000 works. The pages are supposed to be 8K, that is 8192 bytes of which only 8060 are accessible for data storage (due to overhead).
Now, I currently have a table containing 8 fields. Two of these fields are varchar and should be converted to nvarchar. One of the varchar fields is limited to 255 characters and the other to 4000 characters. When I convert the 255 characters field to nvarchar it works just fine, but when I want to convert the 4000 characters field I get an error from MS SQL saying that it gets to big. Is the error only for the 4000 characters field (which growths to 8000 bytes when using nvarchar instead of varchar) or must the whole table fit into one datapage?
Could a blob maybe solve my problem, or will I face new problems when storing unicode characters in a blob?

Thanks in advance

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Jan 14, 2006

I have a table with a Varchar field that will contain encrypted data. Since each byte can have a value from 0 through 255, can I use Varchar or should I change the field to NVarchar? The reason I ask is that during testing, the Varchar field sometimes is truncated, supposed to be 16 bytes but ends up as 5 or 6 or something less than 16.

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Feb 17, 2006

What is the difference between the nvarchar and varchar datatypes? Which should be used?

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Apr 10, 2006

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May 22, 2006

hi

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Oct 10, 2007

I have table with a field defined as nvarchar. I want to change it to varchar. I have a stored procedure which defines the parameter @strCall_desc as nvarchar(4000). Are there going to be ay problems with running this sp if I just change the field type as described.

TIA

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Jul 20, 2005

HiThe maximum length of a nvarchar could be 4000 characters while that ofvarchar could be 8000.We are trying to use unicode which would require that the datatype forone our fields be converted from varchar to nvarchar. But looks likethis would result in loss of existing data.Is there a way to do this without loss of data?Many thanks.*** Sent via Developersdex http://www.developersdex.com ***Don't just participate in USENET...get rewarded for it!

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Mar 14, 2006

I am using SQL Express

I have a very simple function to retreive the maximum value (MemberID) from a member table.  The memberID column is in "nvarchar(8)" type.

The following shows the function:

ALTER FUNCTION dbo.GetLastMemberID()
RETURNS nvarchar(8)
AS
BEGIN
 RETURN (SELECT ISNULL(MAX(MemberID),'IM000000') FROM MemberInfo)
END

When i run the function, only the first 4 character (say 'IM00') is returned.

If I change the "RETURNS nvarchar(8)" to either "RETURNS nvarchar(16)" or "RETURNS varchar(8)", whole column (8 characters) is returned.

My question: should I use nvarchar(16) or varchar(8) in the function in this case?

Thanks

 


 

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Apr 11, 2006

Please I know this is fustrating but I really need help with this issue:



I am getting data conversion error when I tried to load data from one SQl table to another SQL table using SSIS.

The source table has a column with data type nvarchar(max). Also the destination table has the same data type nvarchar(max) but I keep getting conversion error when I use SCD transformation.

Error: " Input column "des" (116) has a long object data type of DT_TEXT, DT_NTEXT or DT_IMAGE which is not supported"

I am fine when I use OLEDB destination but I want to do an incremental load.

Is there a quick fix for this?



Thanks

Omon

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Jun 26, 2007

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Feb 2, 2005

Hi, all
I am seting up a table with email message, I am wondering what is the max length for varchar field. I am so reluctant to use text field, since when
I run query for the descriptiona in sql analyzer, text field cannot be fully display in column. Any tricks to share?
Thanks
Betty

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Hi, everyone, I want to know is there a way for me to set varchar to store more than 8000 characters? (I did checked from sql server books online and i know that the maximum storage for varchar, but i just want to know is there any exceptional way for me to store more than that).

Thanks for any reply.

aex

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Oct 7, 2007

Hi,

I have a column set to varchar(12) so I can ensure that the length of the string entered will never be more than 12 characters but I want to limit the string to a minimum of 8 characters, so I end up with a string that is from 8-12 characters long. How do I ensure the minimum length of 8 characters? I'm using SQL Server 2005 if that helps. I tried adding a check constraint like so:

DATALENGTH(UserName) >= 8

But I keep getting an error when I save the table, so any help would be very much appreciated.

Thanks

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Sep 14, 2007

Hi mates,

I have a Table:Test with column text:varchar(255). I want get rows where text length to be longer than 100. Is it possible?

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Jun 20, 2007

I have looked at several explinations and I understand the difference between unicode and non-unicode.
I get that the basic idea around storage is "double", 2 bytes instead of 1.
My question is, does the 2 byte instead of 1 byte rule apply even if I am storing a char that doesn't need the full to bytes.
for arguments sake I have a table called "UnicodeTable" and one column called "Letter".
If I store the letter "A" on the first row of the "UnicodeTable" does the size of my database increase by 2 bytes?
 

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May 4, 2004

I have an existing application that relies on a SQL Server database.

I want to switch all varchar fields to nvarchar so it can handle multiple languages.

The database has ~25 tables, many of which have varchar fields. I want to convert them all to nvarchar.

The database has ~150 stored procedures, many of which have varchar fields. I want to convert them all to nvarchar.

Are there any tools out there that would let me convert the tables of my choosing, and the stored procedures of my choosing, so that any 'varchar' mentions are changed to 'nvarchar' ? I've only used SQL Query Analyzer to write queries and use MS Access (and some SQL Enterprise Manager) to make the tables and relationships.

Thanks,
-Bret

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We have few stored procedures that use nvarchar datatype, this was not issue on SQL server 7.0 but in 2000 becomes a big issue.
For example query that runs for 3 minutes in SQL server 2000 by replacing NVARCHAR to VARCHAR the same query runs for 2 seconds.
The biggest challenge that I have deals with tables and user-defined datatypes of NVARCHAR that has been bounded to the table.
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