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http://docs.oracle.com/cd/B12037_01/server.101/b10759/functions153.htm
Syntax
SYS_GUID()
Purpose
SYS_GUID generates and returns a globally unique identifier (RAW value) made up of 16 bytes. On most platforms, the generated identifier consists of a host identifier, a process or thread identifier of the process or thread invoking the function, and a nonrepeating value (sequence of bytes) for that process or thread.
Examples
The following example adds a column to the sample table hr.locations, inserts unique identifiers into each row, and returns the 32-character hexadecimal representation of the 16-byte RAW value of the global unique identifier:
ALTER TABLE locations ADD (uid_col RAW(32));
UPDATE locations SET uid_col = SYS_GUID();
SELECT location_id, uid_col FROM locations;
LOCATION_ID UID_COL
----------- ----------------------------------------
1000 7CD5B7769DF75CEFE034080020825436
1100 7CD5B7769DF85CEFE034080020825436
1200 7CD5B7769DF95CEFE034080020825436
1300 7CD5B7769DFA5CEFE034080020825436
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