GoogleSQL for BigQuery supports the following utility functions.
GENERATE_UUID
GENERATE_UUID()
Description
Returns a random universally unique identifier (UUID) as a STRING.
The returned STRING consists of 32 hexadecimal
digits in five groups separated by hyphens in the form 8-4-4-4-12. The
hexadecimal digits represent 122 random bits and 6 fixed bits, in compliance
with RFC 4122 section 4.4.
The returned STRING is lowercase.
Return Data Type
STRING
Example
The following query generates a random UUID.
SELECT GENERATE_UUID() AS uuid;
+--------------------------------------+
| uuid |
+--------------------------------------+
| 4192bff0-e1e0-43ce-a4db-912808c32493 |
+--------------------------------------+