RAND
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Returns a random float or double between 0 and 1.
Syntax
RAND ( [seed] )
Arguments
-
seed: any valid numerical value.
Return type
A random float or double between 0 and 1.
Examples
In this example, note how the values in the rand() column differ across calls, and rand(1234) remains the same.
CREATE TABLE randos (i bigint primary key);INSERT INTO randos VALUES (1), (2), (3), (4);
SELECT i, RAND(), RAND(1234) FROM randos;+---+---------------------+----------------------+| i | RAND() | RAND(1234) |+---+---------------------+----------------------+| 1 | 0.060627053578449 | 0.9903344706785644 || 2 | 0.6705938059950731 | 0.9595036873433918 || 3 | 0.0033184406209954 | 0.30311394845511597 || 4 | 0.16278354692338404 | 0.021165254013737034 |+---+---------------------+----------------------+
SELECT i, RAND(), RAND(1234) FROM randos;+---+--------------------+----------------------+| i | RAND() | RAND(1234) |+---+--------------------+----------------------+| 1 | 0.4223319269518615 | 0.9903344706785644 || 2 | 0.0984310326439255 | 0.9595036873433918 || 3 | 0.5731110152577712 | 0.30311394845511597 || 4 | 0.3304480903355833 | 0.021165254013737034 |+---+--------------------+----------------------+
SELECT i, CEIL(RAND() * 100) FROM randos;+---+--------------------+| i | CEIL(RAND() * 100) |+---+--------------------+| 1 | 1 || 2 | 90 || 3 | 77 || 4 | 80 |+---+--------------------+
SELECT i FROM randos ORDER BY RAND();+---+| i |+---+| 4 || 1 || 2 || 3 |+---+
Last modified: February 24, 2023