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sqlpostgresqlrandom

Generate a random number in the range 1 - 10

Since my approach for a test query which I worked on in this question did not work out, I'm trying something else now. Is there a way to tell pg's random() function to get me only numbers between 1 and 10?

Solution

  • If by numbers between 1 and 10 you mean any float that is >= 1 and < 10, then it's easy:

    select random() * 9 + 1

    This can be easily tested with:

    # select min(i), max(i) from (
    select random() * 9 + 1 as i from generate_series(1,1000000)
) q;
       min       |       max
-----------------+------------------
 1.0000083274208 | 9.99999571684748
(1 row)

    If you want integers, that are >= 1 and < 10, then it's simple:

    select trunc(random() * 9 + 1)

    And again, simple test:

    # select min(i), max(i) from (
    select trunc(random() * 9 + 1) as i from generate_series(1,1000000)
) q;
 min | max
-----+-----
   1 |   9
(1 row)