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# How to Generate a Random Number in a Range

**Summary**: This tutorial shows you how to develop a user-defined function that generates a random number between two numbers.

PostgreSQL provides the [`random()`](../postgresql-math-functions/postgresql-random) function that returns a random number between 0 and 1. The following statement returns a random number between 0 and 1.

```sql
SELECT random();
```

```text
      random
-------------------
 0.867320362944156
(1 row)
```

To generate a random number between 1 and 11, you use the following statement:

```sql
SELECT random() * 10 + 1 AS RAND_1_11;
```

```text
    rand_1_11
------------------
 7.75778411421925
(1 row)
```

If you want to generate the random number as an integer, you apply the `floor()` function to the expression as follows:

```sql
SELECT floor(random() * 10 + 1)::int;
```

```text
 floor
-------
     9
(1 row)
```

Generally, to generate a random number between two integers low and high, you use the following statement:

```sql
SELECT floor(random() * (high-low+1) + low)::int;
```

You can [develop a user-defined function](../postgresql-plpgsql/postgresql-create-function) that returns a random number between two numbers `low` and `high`:

```sql
CREATE OR REPLACE FUNCTION random_between(low INT ,high INT)
   RETURNS INT AS
$$
BEGIN
   RETURN floor(random()* (high-low + 1) + low);
END;
$$ language 'plpgsql' STRICT;
```

The following statement calls the `random_between()` function and returns a random number between 1 and 100:

```sql
SELECT random_between(1,100);
```

```text
 random_between
----------------
             81
(1 row)
```

If you want to get multiple random numbers between two integers, you use the following statement:

```sql
SELECT random_between(1,100)
FROM generate_series(1,5);
```

```text
 random_between
----------------
             37
             82
             19
             92
             43
(5 rows)
```

In this tutorial, you have learned how to generate a random number between a range of two numbers.

---

## Related docs (Useful Techniques)

- [Server and Database Objects](https://neon.com/postgresql/postgresql-tutorial/postgresql-server-and-database-objects)
- [Compare Two Tables](https://neon.com/postgresql/postgresql-tutorial/compare-two-tables-in-postgresql)
- [generate_series() Function](https://neon.com/postgresql/postgresql-tutorial/postgresql-generate_series)
- [PostgreSQL vs. MySQL](https://neon.com/postgresql/postgresql-tutorial/postgresql-vs-mysql)