versioned_docs/version-2.1/sql-manual/sql-functions/numeric-functions/random.md

---
{
    "title": "RANDOM",
    "language": "en"
}
---

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## 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

```sql
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