Function to generate GUID a unique identifier

[Shestakov]

select sys_guid() from dual;

SYS_GUID()
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9F3B753A5D502819E0301FAC1EC83A1A

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 and 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.

This is not GUID for OLE -->"{08000000-0000-0000-0000-000000000000}".