How to create UUID inside Oracle

For the reason of unique identification of records in a database normally a unique integer value is sufficient. However, if records shall be exchange between databases a globally unique identification is required. UUIDs would be nice. But they shall be not created in a database Client but automatically inside the database.
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Usage of SYS_GUID function

The function SYS_GUID of oracle databases provides this functionality. It can be applied according to the following example