Nchar, Varchar,char?
Jan 11, 2008What is the difference between the above data types in SQL? Which datatype should I use if I wanted both numbers and characters?
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Nchar Or Char Or Nvarchar Or Varchar???
Apr 19, 2004Hi,
Which of the above data type (alongwith size) should be used for storing things like Customer Name, Company name etc . ???
Also, what really is the benefit of one over the over :confused:
Thanks
Datatypes Nchar/nvarchar Vs Char/varchar
Dec 2, 2005can anybody please explain me why microsoft using nvarchar/nchar instead of varchar/char in northwind database and pubs database. I know if a column holds unicode data you should use nvarchar or nchar but for me all those tables in northwind/pubs are not holding unicode data. but still why microsoft settled for nchar/nvarchar.
View 2 Replies View RelatedData Types (char, Varchar, Nchar, Nvarchar, ...)
Jul 27, 2007Could someone please help me by explaining which one is best to use and when? For example, storing the word "Corona Del Mar" - which Data Type would be suggested?
Thanks.
Converting CHAR/VARCHAR/TEXT Into NCHAR/NVARCHAR/NTEXT!!!
Jan 28, 2005Hi,
We are in process of converting all of the data type of the fields from CHAR/VARCHAR/TEXT into NCHAR/NVARCHAR/NTEXT (DBCS). Having more than 900 store procedure its look like real pain to make modification in all of the SPs.
After failed to find any help from GOOGLE, I am posting this request. I am basically looking for any automated tool which are convert data type in SP based on the field of the table used in the SP. Or at least which can provide me some sort of list which can helpful for doing manual reactoring.
PLEASE HELP ME!!!
Thanks,
Firoz Ansari
What's Difference About Datatype Char,VarChar,NChar,NVarChar In Sql 2000 ?
Jan 9, 2006Hi All:
I am new to Sql 2000 database,Now I'm planing to create a table in my databse,my table included below fields like this :
PoNo(the length is 15 characters) ,Supplier Name(the length is 50 characters).etc
but I don't how to select the datatype for them. should I select Char or VarChar ?
which one is the best slection ?
thans in advanced!
Conversion From Char To Nchar
Apr 16, 2004Hello,
I am trying to convert a single code page MS Server database into a unicode database, using the unicode data types,NCHAR, NVARCHAR, NTEXT. The problem is that in the original database, indexes and constraints have been defined on the tables whose configurations need to be changed. As a result, the ALTER TABLE command fails. Are there any other alternative solutions?
Also, data from the old database needs to be preserved. The objective is to create a unicode database which keeps the old data intact as well as accepts the new data in unicode.
It would be great if you could help!
Thanks,
Sheetal.
Char Nchar Vchar Nvchar !?
Feb 14, 2006Hello
in MS SQL 2000 for text it is possible ti use
char
nchar
varchar
nvarchar
what must be used and for what ?
I want to store normal text with occidental char (accents)
thank you
Changing Char/NChar Column From NOTNULL To NULL
Apr 19, 2008Hi I have a table, which contains Char and NChar NOT NULL columns
Now I need to change it to NULL, when I use the following command, it fails for the following error,
The command I used,
ALTER TABLE <TableName>
ALTER COLUMN <ColName> CHAR NULL
ALTER TABLE <TableName>
ALTER COLUMN <ColName> NCHAR NULL
Msg 8152, Level 16, State 13, Line 1
String or binary data would be truncated.
The statement has been terminated.
But for the same table, the below command executes fine,
ALTER TABLE <TableName>
ALTER COLUMN <ColName> SMALLINT NULL
Also I can change the NULLABILITY from NOTNULL to NULL using Enterprise Manger, editing the table using Table Design and selecting Allow Nulls option.
I need a script to accomplish this task.
Any help would be greatly appreciated.
-Senthil
This Stored Procedure Can Be Used To Search And Replace Substring In The Char, Nchar,
Jan 9, 2006#1 This stored procedure can be used to search and replace substring in the char, nchar, varchar and nvarchar columns in all tables in the current database. You should pass the text value to search and the text value to replace. So, to replace all char, nchar, varchar and nvarchar columns which contain the substring 'John' with the substring 'Bill', you can use the following (in comparison with the SetTbColValues stored procedure, this stored procedure replace only substring, not the entire column's value):
EXEC replace_substring @search_value = 'John', @replace_value = 'Bill'
Datatype Question Varchar(max), Varchar(250), Or Char(250)
Oct 18, 2007
I have a table that contains a lot of demographic information. The data is usually small (<20 chars) but ocassionally needs to handle large values (250 chars). Right now its set up for varchar(max) and I don't think I want to do this.
How does varchar(max) store info differently from varchar(250)? Either way doesn't it have to hold the container information? So the word "Crackers" have 8 characters to it and information sayings its 8 characters long in both cases. This meaning its taking up same amount of space?
Also my concern will be running queries off of it, does a varchar(max) choke up queries because the fields cannot be properly analyzed? Is varchar(250) any better?
Should I just go with char(250) and watch my db size explode?
Usually the data that is 250 characters contain a lot of blank space that is removed using a SPROC so its not usually 250 characters for long.
Any insight to this would be appreciated.
Char Vs Varchar
Dec 5, 2001Hi,
Does any body know of any performance implications of using 'varchar' data type against 'char'?
I have some columns that are using 'char' data type, but the data in them is not fixed length. So, to gain some disk space I am planning to change the data type to 'varchar'. But, I am concerned if there will be any performance de-gradation or any other implications of doing this.
Regards
Chakri
CHAR Vs VARCHAR
Mar 26, 2001Hi,
Is that true that using CHAR datatype improves the performance comparing to VARCHAR
thanks
indeed.
VARCHAR Vs. CHAR
Oct 27, 2000Why would you want to use char when you have varchar? Is there any performance hit using a varchar and the size you make that varchar?
Debate going at work.
Phil
Varchar V Char
Feb 17, 1999I have recently inherited a database where all of the tables use varchar instead of chars for fields. Very , very few of these fields are involved in keys of even indices, but performance is an issue. I thought that I had read that varchars are worse for performance than chars when page splits may occur. Is this related to updates only, or does it matter?
Any help appreciated.
Char (8) Vs. Varchar (8)
May 8, 2006In relation to the code in this thread
http://forums.databasejournal.com/showthread.php?t=42622
My customer code field is Char (8) but accept an argument of Varchar (8) to my stored procedure. Don't ask me why!?!!
The customer code could be anything from 'A' to 'ZZZZZZZZ'.
Will this have any effect especially relating to overhead and retrieving incorrect data?
Char Vs Varchar
Feb 21, 2006Hi,
This question may sound silly,but please comment.
Please tell me a situation where char should be used and not varchar.
Let us assume that we are dealing with non unicode characters.
Well, I find varchar is always smarter than char, so why char?
Thanks!!
Rudra
Varchar And Char
Feb 9, 2004i would like to know if there is an overhead in using VARCHAR when you use to store it...
a colleague of mine claims that if the field is defined to be VARCHAR the system creates and additional column DOUBLE/DECIMAL with storage size of 17/18bytes.
such that if the size of the varchar field is less than 30 it is better to be defined as CHAR instead.
please help me out here... i think there's something wrong with his statement, but i need concrete proof to it... a link to page or pdf file would be very much appreciated.
Char Vs. Varchar
Jul 23, 2005Greetings,I have a question. I work on some SQL2k/ASP.NET apps at work. Mypredacessor, who created the databases/tables seemed to have liked touse 'char' for all text fields. Is there a reason why he would havedone this over using varchar? It's a minor annoyance to always have toRTRIM data and it makes directly making changes to the database moreannoying (with all the pointless trailing spaces)?I usually use char for fixed string lengths, like state abbreviationsor something, and varchar for strings of unknown length.Is it a performance issue? Our database doesn't do much traffic, forthe most part.
View 5 Replies View RelatedChanged From Char To Varchar
Jun 3, 2004i changed my state table from char 20 to varchar 20 and it still fills it with empty space at the end of the statename
I tried entering it with the trim command still no good
i looked a the sql command made in vs and it says that the variables are varchar
is there something i am missing with varchar
does it only work properly if it is over 50 or does it not change completely when you change from char to varchar
VarChar Or Char Faster?
Mar 30, 2006Does using varchar or varchar(max) affect the system performance?
Should I use fixed size coloumns to increase speed?
Why Specify The Char Length In Varchar?
Feb 6, 2002Newbie question:
Why bother specifing the length in varchar()?
Why not just specify the max and not worry about truncation?
Thanks,
Martin
Difference Between CHAR And VARCHAR
Aug 8, 2002I have one question to all SQL Guru's
I know the basic difference between CHAR and VARCHAR of CHAR taking all the space it is declared with and VARCHAR taking only amount of space used.
I want to know or link to any doucment which gives the difference between CHAR and VARCHAR more than what is mentioned above.
Please this is a urgent requirment.
Thanks in advance.
Difference Between Char & Varchar
Nov 6, 2007what'z the difference between char & varchar, like i am doing a cast function, which one should be used..
View 11 Replies View RelatedHow Many Char's In Varchar Record
Aug 22, 2005helloHow could I check how many chars are in record, defined as varchar(8000).It's obvious that in such defined record could be 1 char to 8000 char. Butwhat query to SQL database should I post to give information about realylenght of this records ?thanks from advanceAdam
View 5 Replies View RelatedChar Or Varchar For A Primary Key?
May 28, 2007Hi,I'm planning the structure of a SqlServer 2005 database for a newapplication.The requirement is that primary keys must be "natural"; i.e. in the tableCustomers the primary key will be a max. 10 characters string (but thestring may be filled i.e. with only 5 charachters).Should I define these primary keys as char[5] or varchar[5]?I'm interested in your opinion in particular about performace issue, becausethere will be tables with millions of records...Thanks,Davide.
View 7 Replies View RelatedChar Vs Varchar And Indexes
Sep 7, 2007all these while i've only used varchar for any stringi heard from my ex-boss that char helps speed up searches. is thattrue?so there are these:1) char with index2) char without index3) char with clustered index4) varchar with index5) varchar without index6) varchar with clustered indexsome of my tables primary key (clustered) is a string type. would itbe benificial to use char? or would using (6) makes no difference?for non primary key columns that needs to be searched a lot, can i say(1) is the best?
View 4 Replies View RelatedSQL Variable Char Kinda Like Varchar
Jul 26, 2005Hi, is there a type of data that we don't need to specify the length but can grow dynamically?instead of using varchar 2000, a type that acts like a varchar but the length is unlimited ....Thanks,
View 5 Replies View Related% Performance Impact If Use Varchar Instead Of Char?
Feb 19, 2004Hi,
Anybody have any idea howmuch % of performance will be affect if we are using varchar instead of char data type?.
Thanks,
Ravi
Convert Varchar Or Char To Float
Jan 4, 2006Hello,
Is there a way to convert varchar or char to float?
Thank you
Can Varchar Length Be Set To More Than 8000 Char?
May 22, 2006Hi, 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
Char Vs Varchar + Padding Issue
Feb 20, 2008I have upsized some tables from ms access (using the wizard) which has created many nvarchar fields. I know the system doesn't need unicode characters so I straight away changed them to varchar and the system is all working but am now deciding on which ones to change to char as I understand you get a performance gain. I am trying to do this without changing much ms access front end code so don't want to deal with rtrim I am thinking change the ones I can guarantee the length of. These happen to be the primary keys.
My questions are is this the correct way of doing things, am I correct in assuming I would have to rtrim alot in program code if I changed all to char.
Finally and. most importantly what about a single character field which could be null can I make this a char(1) and it will still return null if empty as it would as a varchar(1). I suppose this question is how does the padding work is it the character followed by a number of nulls (ascii 0 I think).
Sorry for the multiple questions but I think they are all related
Join Zero Padded Char To Varchar
May 31, 2008Having a brain fart and can't figure this out...I have 2 databases I need to join:db1.customer.customer_no char(15) right justified, zero paddedsample customer numbers:000000000000001000000000000010000000000000234000000000012345db2.customer.customer_no varchar(20) left justified, no paddingsample customer numbers:11023412345How do I join tables on customer_no? Use cast, convert? Strip zeroes fromdb1 table?Thanks.
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