SQL Clone
SQLServerCentral is supported by Redgate
 
Log in  ::  Register  ::  Not logged in
 
 
 


CASTing


CASTing

Author
Message
Carlo Romagnano
Carlo Romagnano
SSChampion
SSChampion (10K reputation)SSChampion (10K reputation)SSChampion (10K reputation)SSChampion (10K reputation)SSChampion (10K reputation)SSChampion (10K reputation)SSChampion (10K reputation)SSChampion (10K reputation)

Group: General Forum Members
Points: 10049 Visits: 3467
Comments posted to this topic are about the item CASTing
Ramkumar.K
Ramkumar.K
Say Hey Kid
Say Hey Kid (669 reputation)Say Hey Kid (669 reputation)Say Hey Kid (669 reputation)Say Hey Kid (669 reputation)Say Hey Kid (669 reputation)Say Hey Kid (669 reputation)Say Hey Kid (669 reputation)Say Hey Kid (669 reputation)

Group: General Forum Members
Points: 669 Visits: 161
Hi All..


declare @c varchar(8000)
set @c = N'hello'



In the above statement there is the "N" mentioned in the beginning of the string.. what does it mean exactly???

Is it indirectly enforcing the casting of varchar into Nvarchar????

Can any one explain??

Thanks in advance..

Ramkumar . K
Senior Developer
######################
No Surrender... No Give Up....
######################
HanShi
HanShi
SSChampion
SSChampion (14K reputation)SSChampion (14K reputation)SSChampion (14K reputation)SSChampion (14K reputation)SSChampion (14K reputation)SSChampion (14K reputation)SSChampion (14K reputation)SSChampion (14K reputation)

Group: General Forum Members
Points: 14554 Visits: 3765
Hi,

You can find this information about the N-prefix in the BOL:
Unicode string constants that appear in code executed on the server, such as in stored procedures and triggers, must be preceded by the capital letter N. This is true even if the column being referenced is already defined as Unicode. Without the N prefix, the string is converted to the default code page of the database. This may not recognize certain characters.

Hans

** Don't mistake the ‘stupidity of the crowd’ for the ‘wisdom of the group’! **
Stef315
Stef315
Mr or Mrs. 500
Mr or Mrs. 500 (592 reputation)Mr or Mrs. 500 (592 reputation)Mr or Mrs. 500 (592 reputation)Mr or Mrs. 500 (592 reputation)Mr or Mrs. 500 (592 reputation)Mr or Mrs. 500 (592 reputation)Mr or Mrs. 500 (592 reputation)Mr or Mrs. 500 (592 reputation)

Group: General Forum Members
Points: 592 Visits: 14
Where does it say anything about 4000?
Stupeo
Stupeo
SSCommitted
SSCommitted (1.6K reputation)SSCommitted (1.6K reputation)SSCommitted (1.6K reputation)SSCommitted (1.6K reputation)SSCommitted (1.6K reputation)SSCommitted (1.6K reputation)SSCommitted (1.6K reputation)SSCommitted (1.6K reputation)

Group: General Forum Members
Points: 1589 Visits: 778
The answer says it's cast as nvarchar(4000) initially, but i too dont see how?

Am i missing something, or is there a typo?

Matt
HanShi
HanShi
SSChampion
SSChampion (14K reputation)SSChampion (14K reputation)SSChampion (14K reputation)SSChampion (14K reputation)SSChampion (14K reputation)SSChampion (14K reputation)SSChampion (14K reputation)SSChampion (14K reputation)

Group: General Forum Members
Points: 14554 Visits: 3765
Because of the N-prefix the value is cast to NVarChar. The NVarChar(MAX) can contain a maximum of 4000.
BOL:
nvarchar [ ( n | max ) ]
Variable-length Unicode character data. n can be a value from 1 through 4,000. max indicates that the maximum storage size is 2^31-1 bytes. The storage size, in bytes, is two times the number of characters entered + 2 bytes. The data entered can be 0 characters in length. The SQL-2003 synonyms for nvarchar are national char varying and national character varying.


** Don't mistake the ‘stupidity of the crowd’ for the ‘wisdom of the group’! **
Stupeo
Stupeo
SSCommitted
SSCommitted (1.6K reputation)SSCommitted (1.6K reputation)SSCommitted (1.6K reputation)SSCommitted (1.6K reputation)SSCommitted (1.6K reputation)SSCommitted (1.6K reputation)SSCommitted (1.6K reputation)SSCommitted (1.6K reputation)

Group: General Forum Members
Points: 1589 Visits: 778
Thankyou Hanshi.

Ive always wondered what the N was for. Thanks.

Matt.
Craig@Work
Craig@Work
SSCommitted
SSCommitted (1.5K reputation)SSCommitted (1.5K reputation)SSCommitted (1.5K reputation)SSCommitted (1.5K reputation)SSCommitted (1.5K reputation)SSCommitted (1.5K reputation)SSCommitted (1.5K reputation)SSCommitted (1.5K reputation)

Group: General Forum Members
Points: 1526 Visits: 326
Very good question Smile

Tests number of areas of knowledge .. what something logically represents vs. what is physically represents

Cool
Simon Facer
Simon Facer
Hall of Fame
Hall of Fame (3.3K reputation)Hall of Fame (3.3K reputation)Hall of Fame (3.3K reputation)Hall of Fame (3.3K reputation)Hall of Fame (3.3K reputation)Hall of Fame (3.3K reputation)Hall of Fame (3.3K reputation)Hall of Fame (3.3K reputation)

Group: General Forum Members
Points: 3251 Visits: 724
Just to clarify HanShi's posting - NVARCHAR(MAX) is not limited to 4000 characters. The maximum length of VARCHAR(MAX) is 2^31 -1 (2,147,483,647) characters.



Michael.Beeby
Michael.Beeby
Mr or Mrs. 500
Mr or Mrs. 500 (539 reputation)Mr or Mrs. 500 (539 reputation)Mr or Mrs. 500 (539 reputation)Mr or Mrs. 500 (539 reputation)Mr or Mrs. 500 (539 reputation)Mr or Mrs. 500 (539 reputation)Mr or Mrs. 500 (539 reputation)Mr or Mrs. 500 (539 reputation)

Group: General Forum Members
Points: 539 Visits: 688
Uses per character 16 bits rather than 8.
Go


Permissions

You can't post new topics.
You can't post topic replies.
You can't post new polls.
You can't post replies to polls.
You can't edit your own topics.
You can't delete your own topics.
You can't edit other topics.
You can't delete other topics.
You can't edit your own posts.
You can't edit other posts.
You can't delete your own posts.
You can't delete other posts.
You can't post events.
You can't edit your own events.
You can't edit other events.
You can't delete your own events.
You can't delete other events.
You can't send private messages.
You can't send emails.
You can read topics.
You can't vote in polls.
You can't upload attachments.
You can download attachments.
You can't post HTML code.
You can't edit HTML code.
You can't post IFCode.
You can't post JavaScript.
You can post emoticons.
You can't post or upload images.

Select a forum







































































































































































SQLServerCentral


Search