RANDOM

random

description

Syntax

DOUBLE random() Returns a random number between 0 and 1.

DOUBLE random(DOUBLE seed) Returns a random number between 0 and 1, seeded with seed.

BIGINT random(BIGINT a, BIGINT b) Returns a random number between a and b. a must be less than b.

Alias: rand.

Note: All parameters must be constants.

example

mysql> select random();
+---------------------+
| random()            |
+---------------------+
| 0.35446706030596947 |
+---------------------+

mysql> select rand(1.2);
+---------------------+
| rand(1)             |
+---------------------+
| 0.13387664401253274 |
+---------------------+
1 row in set (0.13 sec)

mysql> select rand(1.2);
+---------------------+
| rand(1)             |
+---------------------+
| 0.13387664401253274 |
+---------------------+
1 row in set (0.11 sec)

mysql> select rand(-20, -10);
+------------------+
| random(-20, -10) |
+------------------+
|              -13 |
+------------------+
1 row in set (0.10 sec)

keywords

RANDOM, RAND