|Oracle9i SQL Reference
Release 2 (9.2)
Part Number A96540-02
COMPOSE takes as its argument a string in any datatype, and returns a Unicode string in its fully normalized form in the same character set as the input.
string can be any of the datatypes
NCLOB. For example, an "o" codepoint qualified by an umlaut codepoint will be returned as the o-umlaut codepoint.
Oracle9i Database Concepts for information on Unicode character sets and character semantics
The following example returns the o-umlaut codepoint: