Categories:

String & binary functions (General) , Data generation functions

UUID_STRING

Generates either a version 4 (random) or version 5 (named) RFC 4122-compliant universally unique identifier (UUID) as a formatted string.

Syntax

UUID_STRING()

UUID_STRING( '<uuid>' , '<name>' )
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Arguments

'uuid'

A valid UUID string. This value is the namespace used to generate the returned UUID.

'name'

The name used to generate the returned UUID.

Returns

This function returns a 128-bit value, formatted as a string (VARCHAR data type).

Usage notes

UUID_STRING supports generating two versions of UUIDs, both compliant with RFC 4122:

  • A version 4 (random) UUID is returned when no arguments are provided to the function. For random-number generation, the 64-bit Mersenne twister (link removed) known as MT19937-64 is used.

  • A version 5 (named) UUID can be produced by providing a uuid string (known as the namespace) as the first argument and a name string as the second argument.

Examples

Generate a random UUID:

SELECT UUID_STRING();
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+--------------------------------------+
| UUID_STRING()                        |
|--------------------------------------|
| d47f4e30-306f-4940-8921-c154094df1a1 |
+--------------------------------------+

Generate a named UUID:

SELECT UUID_STRING('fe971b24-9572-4005-b22f-351e9c09274d','foo');
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+-----------------------------------------------------------+
| UUID_STRING('FE971B24-9572-4005-B22F-351E9C09274D','FOO') |
|-----------------------------------------------------------|
| dc0b6f65-fca6-5b4b-9d37-ccc3fde1f3e2                      |
+-----------------------------------------------------------+

Create a table and insert random UUIDs:

CREATE OR REPLACE TABLE uuid_insert_test(random_uuid VARCHAR(36), test VARCHAR(10));

INSERT INTO uuid_insert_test (random_uuid, test) SELECT UUID_STRING(), 'test1';
INSERT INTO uuid_insert_test (random_uuid, test) SELECT UUID_STRING(), 'test2';
INSERT INTO uuid_insert_test (random_uuid, test) SELECT UUID_STRING(), 'test3';
INSERT INTO uuid_insert_test (random_uuid, test) SELECT UUID_STRING(), 'test4';
INSERT INTO uuid_insert_test (random_uuid, test) SELECT UUID_STRING(), 'test5';

SELECT * FROM uuid_insert_test;
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+--------------------------------------+-------+
| RANDOM_UUID                          | TEST  |
|--------------------------------------+-------|
| 7745a0cf-d136-406b-9289-38072d242871 | test1 |
| 8c31e031-a6bf-479d-9abb-b7909f298ba1 | test2 |
| e65d5641-01c0-4126-b80d-c5ae6d4848be | test3 |
| bd02bf4e-fa5d-498d-8a9a-d38200f1ca30 | test4 |
| 4df2a34e-ad65-46b4-a51a-3eb9394aeb83 | test5 |
+--------------------------------------+-------+
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