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