Rand functions

These functions can be used when generating random data values.

rand

The rand function generates a random float, between 0 and 1.

rand() -> number

The following example shows this function, and its output, when used in a RETURN statement:

RETURN rand();

0.7062321084863658

The following example shows this function being used in a SELECT statement with an ORDER BY clause:

SELECT * FROM [{ age: 33 }, { age: 45 }, { age: 39 }] ORDER BY rand();


[
	{
		age: 45
	},
	{
		age: 39
	},
	{
		age: 33
	}
]

rand::bool

The rand::bool function generates a random boolean value.

rand::bool() -> bool

The following example shows this function, and its output, when used in a RETURN statement:

RETURN rand::bool();

true

rand::duration

The rand::duration function generates a random duration value between two duration arguments.

rand::bool($from: duration, $to: duration) -> duration

Some examples of the function in use:

rand::duration(1ns, 1ms);

rand::duration(0ns, duration::max);

-------- Query 1 --------
435µs884ns

-------- Query 2 --------
405337457164y36w2d5h54m8s16ms76µs191ns

rand::enum

The rand::enum function generates a random value, from a multitude of values.

rand::enum(value...) -> any
rand::enum(array<value>) -> any

The argument to this function can take either comma-separated values or an array of values.

rand::enum('one', 'two', 3, 4.15385, 'five', true);
rand::enum(['one', 'two', 3, 4.15385, 'five', true]);

"five"

As nested values are not combined at greater levels of depth, the following example will return either [8, 9] or [10, 11], but never an individual number.

RETURN rand::enum([
    [8,9],
    [10,11]
]);

rand::float

The rand::float function generates a random float, between 0 and 1.

rand::float() -> float

If two numbers are provided, then the function generates a random float, between two numbers.

rand::float($from: number, $to: number) -> float

The following example shows this function, and its output, when used in a RETURN statement:

RETURN rand::float();

0.7812733136200293

RETURN rand::float(10, 15);

11.305355983514927

rand::id

The rand::id function generates a random alphanumeric ID, defaulting to a length of 20 characters.

rand::id() -> string

If a number is provided, then the function generates a random ID with a specific length.

rand::id(number) -> string

If a second number is provided, then the function will generate a random id, with a length between the two numbers.

rand::id($min_len: int, $max_len: int) -> string

The following example shows this function, and its output, when used in a RETURN statement:

RETURN rand::id();

'4uqmrmtjhtjeg77et0dl'

RETURN rand::id(10);

'f3b6cjh0nt'

RETURN rand::id(1, 9);

'894bqt4lp'

This function is used for default record ID keys in SurrealDB, and can be overridden to use a ULID or UUID instead by affixing :ulid() and :uuid() after the table name, respectively.

CREATE 
  person,
  person:ulid(),
  person:uuid()
-- Return only id values for nicer output
RETURN VALUE id;

Output:

[
	person:o9s1sl3ivckuxo0kglix,
	person:01K7JRP6KVAQGN2THR2T13X9WP,
	person:u'0199e58b-1a7b-7880-ad5b-01671678c11f'
]

rand::int

The rand::int function generates a random int.

rand::int() -> int

If two numbers are provided, then the function generates a random int between two numbers.

rand::int($from: int, $to: int) -> int

The following example shows this function, and its output, when used in a RETURN statement:

RETURN rand::int();

6841551695902514727

RETURN rand::int(10, 15);

13

rand::string

The rand::string function generates a random string, with 32 characters.

rand::string() -> string

The rand::string function generates a random string, with a specific length.

rand::string(number) -> string

If two numbers are provided, then the function generates a random string, with a length between two numbers.

rand::string($from: int, $to: int) -> string

The following example shows this function, and its output, when used in a RETURN statement:

RETURN rand::string();

"N8Q86mklN6U7kv0A2XCRh5UlpQMSvdoT"

RETURN rand::string(15);

"aSCtrfJj4pSJ7Xq"

RETURN rand::string(10, 15);

"rEUWFUMcx0YH"

rand::time

The rand::time function generates a random datetime.

rand::time() -> datetime
rand::time($from: datetime|number, $to: datetime|number) -> datetime

The rand::time function generates a random datetime, either a completely random datetime when no arguments are passed in, or between two unix timestamps.

RETURN rand::time();

-- d'1327-07-12T01:00:32Z'

RETURN rand::time(198371, 1223138713);

-- d'1991-01-13T23:27:17Z'

This function can take two datetimes, returning a random datetime in between the least and greatest of the two.

RETURN rand::time(d'1970-01-01', d'2000-01-01');

-- d'1999-05-29T17:02:16Z"

Either of the arguments of this function can now be either a number or a datetime.

RETURN rand::time(0, d'1990-01-01');

-- d'1986-11-17T15:06:01Z'

As of this version, this function returns a datetime between 0000-01-01T00:00:00Z and 9999-12-31T23:59:59Z. Before this, the function returned a random datetime between 1970-01-01T00:00:00Z (0 seconds after the UNIX epoch) and +262142-12-31T23:59:59Z (the maximum possible value for a datetime).

rand::uuid

The rand::uuid function generates a random Version 7 UUID.

rand::uuid() -> uuid
rand::uuid(datetime) -> uuid

The following example shows this function, and its output, when used in a RETURN statement:

RETURN rand::uuid();

[u"e20b2836-e689-4643-998d-b17a16800323"]

The rand::uuid function can also generate a random UUID from a datetime.

RETURN rand::uuid(d"2021-09-07T04:27:53Z");

Note that a UUID has a precision of one millisecond, and thus one converted back to a datetime will truncate nanosecond precision.

LET $now = time::now();
[$now, time::from_uuid(rand::uuid($now))];

-- Output:
[
	d'2026-01-29T02:14:10.057075Z',
	d'2026-01-29T02:14:10.057Z'
]

The rand::uuid function can also be called using its alias rand::uuid::v7.

rand::uuid::v4

The rand::uuid::v4 function generates a random version 4 UUID.

rand::uuid::v4() -> uuid

The following example shows this function, and its output, when used in a RETURN statement:

RETURN rand::uuid::v4();

[u"4def23a5-a847-4934-8dad-c64ccc48921b"]

rand::ulid

The rand::ulid function generates a random ULID.

rand::ulid() -> uuid
rand::ulid(datetime) -> uuid

The following example shows this function, and its output, when used in a RETURN statement:

RETURN rand::ulid();

[u"01H9QDG81Q7SB33RXB7BEZBK7G"]

The rand::ulid function can also generate a random ULID from a datetime type.

The following example shows this function, and its output, when used in a RETURN statement:

RETURN rand::ulid(d"2021-09-07T04:27:53Z");

Note that a ULID has a precision of one millisecond, and thus one converted back to a datetime will truncate nanosecond precision.

LET $now = time::now();
[$now, time::from_ulid(rand::ulid($now))];

-- Output:
[
	d'2026-01-29T02:14:10.057075Z',
	d'2026-01-29T02:14:10.057Z'
]