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uniform function

  • 项目

Applies to: check marked yes Databricks Runtime 16.1 and later

Returns a random value with independent and identically distributed values within the specified range of numbers.

Syntax

uniform (boundaryExpr1, boundaryExpr2 [, seed] )

Arguments

  • boundaryExpr1: A SMALLINT, INT, BIGINT, or floating point constant expression, specifying an inclusive boundary of the range.
  • boundaryExpr2: A SMALLINT, INT, BIGINT, or floating point constant expression, specifying an inclusive boundary of the range.
  • seed: An optional SMALLINT, or INT expression serving as a seed for the random number generation.

Returns

A value of the least common type of boundaryExpr1 and boundaryExpr2.

Examples

> SELECT uniform(10, 20), uniform(10, 20) FROM range(10);
 18  16
 15  10
 14  14
 19  15
 17  11
 17  15
 10  10
 13  13
 14  16
 10  17

-- Using a fixed seed the series is deterministic
> SELECT uniform(10, 20, 0), uniform(10, 20, 0) FROM range(10);
  10  10
  11  11
  19  19
  18  18
  19  19
  14  14
  18  18
  14  14
  10  10
  17  17