RAND
Warning
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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
Note that the value of RAND()
is not a constant - it is a sequence of random values.RAND()
may also be consistent.RAND()
and RAND(1234)
columns differ across calls.
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) |+---+---------------------+-----------------------+| 3 | 0.43534220433377946 | 0.9908611655094324 || 1 | 0.25176617397465795 | 0.43105064430086526 || 2 | 0.9479281528764876 | 0.0022682741705851717 || 4 | 0.8637092072853303 | 0.6844156113248886 |+---+---------------------+-----------------------+
SELECT i, RAND(), RAND(1234) FROM randos;+---+--------------------+---------------------+| i | RAND() | RAND(1234) |+---+--------------------+---------------------+| 3 | 0.5683442772102069 | 0.11764372542933765 || 1 | 0.5781494513957496 | 0.2252007371519833 || 2 | 0.3707790810194105 | 0.9458377938731928 || 4 | 0.400653709702692 | 0.7001088226665313 |+---+--------------------+---------------------+
SELECT i, CEIL(RAND() * 100) FROM randos;+---+--------------------+| i | CEIL(RAND() * 100) |+---+--------------------+| 3 | 86 || 1 | 52 || 2 | 54 || 4 | 92 |+---+--------------------+
SELECT i FROM randos ORDER BY RAND();+---+| i |+---+| 3 || 4 || 1 || 2 |+---+
Last modified: May 19, 2025