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MySQL | RAND method

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Numeric
schedule Jul 1, 2022
Last updated
local_offer MySQL
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MySQL's RAND(~) method returns a random float value between 0 (inclusive) and 1 (exclusive).

Parameters

1. N | int | optional

The seed value to use. By default None.

NOTE

If a particular seed value is specified, the same random number will be generated every time that particular seed value is used. Hence if you run SELECT RAND(3); you will always get 0.9057697559760601

Return value

A random float value between 0 (inclusive) and 1 (exclusive).

Examples

Basic usage

To return a random float value between 0 and 1 (exclusive):

SELECT RAND();
+--------------------+
| RAND() |
+--------------------+
| 0.9960292372815583 |
+--------------------+

To return a random float value between 0 and 10 (exclusive):

SELECT RAND() * 10;
+-------------------+
| RAND() * 10 |
+-------------------+
| 9.803185351009652 |
+-------------------+

Use with FLOOR(~)

To return a random integer between 6 and 12 (exclusive):

SELECT FLOOR(6 + (RAND() * 6));
+-------------------------+
| FLOOR(6 + (RAND() * 6)) |
+-------------------------+
| 11 |
+-------------------------+

Note that by using the FLOOR method we are able to return an integer rather than a floating point value.

Seed parameter

To specify a seed value of 5:

SELECT RAND(5), RAND(5);
+---------------------+---------------------+
| RAND(5) | RAND(5) |
+---------------------+---------------------+
| 0.40613597483014313 | 0.40613597483014313 |
+---------------------+---------------------+

We can see that the same return value is obtained for both columns due to the use of seed value 5.

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Published by Arthur Yanagisawa
Edited by 0 others
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