|Oracle® Database SQL Reference
10g Release 1 (10.1)
Part Number B10759-01
DECOMPOSE is valid only for Unicode characters.
DECOMPOSE takes as its argument a string in any datatype and returns a Unicode string after decomposition in the same character set as the input. For example, an o-umlaut code point will be returned as the "o" code point followed by an umlaut code point.
string can be any of the datatypes
CANONICAL causes canonical decomposition, which allows recomposition (for example, with the
COMPOSE function) to the original string. This is the default.
COMPATIBILITY causes decomposition in compatibility mode. In this mode, recomposition is not possible. This mode is useful, for example, when decomposing half-width and full-width katakana characters, where recomposition might not be desirable without external formatting or style information.
See Also:Oracle Database Globalization Support Guide for information on Unicode character sets and character semantics
The following example decomposes the string "
Châteaux" into its component code points:
SELECT DECOMPOSE ('Châteaux') FROM DUAL; DECOMPOSE --------- Cha^teaux