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  SQL Server Tips by Gama and Naughter

Char

Char stores fixed length ASCII data. The data is padded with spaces on the right as this example shows:

DECLARE @b char(10)
SET @b='abc'
select DATALENGTH(@b)
SELECT @b
SELECT CAST(@b as binary(10))

10
abc
0x61626320202020202020


The 202020 are a sequence of spaces. 20 is the hexadecimal representation of the space character.

Note: An interesting detail is that char can actually store non-ASCII data. In the previous example let us replace the second line with this one:

SET @b='abc'+char(1)+char(2)+char(3)

10
abc
0x61626301020320202020


The three bytes are there, although not visible when displayed.


The above book excerpt is from:

Super SQL Server Systems
Turbocharge Database Performance with C++ External Procedures

ISBN: 0-9761573-2-2
Joseph Gama, P. J. Naughter

 http://www.rampant-books.com/book_2005_2_sql_server_external_procedures.htm  

 

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