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  SQL Server Tips by Burleson

The ASCII Character Set

ASCII (American Standard Code for Information Interchange) is a seven-bit code developed by ANSI (American National Standards Institute). The standard ASCII character set has 128 numbers that correspond to:

* 0 to 31 - control codes, for string, file or device handling.
* 32 – space.
* 48 to 57 – numbers.
* 65 to 90 - capital letters, western alphabet (bit 5 reset).
* 97 to 122 - lower case letters, western alphabet (bit 5 set).

The Extended ASCII Character Set uses the bit seven therefore adding another 128 characters with line drawing and special symbols (international characters, math symbols, currency symbols, simple geometric shapes, etc.). This set has many different variations and one solution for allowing national characters in the Extended Character Set was to define code pages.

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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