| Oracle® OLAP DML Reference 11g Release 2 (11.2) E17122-07 | 
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The ASCIISTR function takes a string in any character set and returns an ASCII version of that string.
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ASCIISTR(text-exp)
A text expression.
How ASCIISTR Converts Non-ASCII Characters
The ASCIISTR function converts non-ASCII characters to \xxxx, where xxxx represents a UTF-16 code unit.
See:
Oracle Database Globalization Support Guide for information on Unicode character sets and character semantics.