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  SQL Server Tips by Gama and Naughter



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 CAST(@b as binary(10))






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)






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


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