RAND
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Syntax
RAND(), RAND(N)
Description
Returns a random DOUBLE
precision floating point value v in the range 0 <= v < 1.0. If
a constant integer argument N is specified, it is used as the seed
value, which produces a repeatable sequence of column values. In the
following example, note that the sequences of values produced by
RAND(3) is the same both places where it occurs.
Statements using the RAND() function are not safe for replication.
The expression to get a random integer from a given range is the following:
FLOOR(min_value + RAND() * (max_value - min_value))
Examples
CREATE TABLE t (i INT); INSERT INTO t VALUES(1),(2),(3); SELECT i, RAND() FROM t; +------+-------------------+ | i | RAND() | +------+-------------------+ | 1 | 0.255651095188829 | | 2 | 0.833920199269355 | | 3 | 0.40264774151393 | +------+-------------------+ SELECT i, RAND(3) FROM t; +------+-------------------+ | i | RAND(3) | +------+-------------------+ | 1 | 0.90576975597606 | | 2 | 0.373079058130345 | | 3 | 0.148086053457191 | +------+-------------------+ SELECT i, RAND() FROM t; +------+-------------------+ | i | RAND() | +------+-------------------+ | 1 | 0.511478140495232 | | 2 | 0.349447508668012 | | 3 | 0.212803152588013 | +------+-------------------+ SELECT i, RAND(3) FROM t; +------+-------------------+ | i | RAND(3) | +------+-------------------+ | 1 | 0.90576975597606 | | 2 | 0.373079058130345 | | 3 | 0.148086053457191 | +------+-------------------+
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