SYS_GUID

Syntax

sys_guid::=

Text description of 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 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.

Example

The following example adds a column to the sample hr.locations table and 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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