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RAND (Transact-SQL)

  • Artykuł

Returns a random float value from 0 through 1.

Topic link iconTransact-SQL Syntax Conventions

Syntax

RAND ( [ seed ] )

Arguments

  • seed
    Is an integer expression (tinyint, smallint, or int) that gives the seed value. If seed is not specified, the Microsoft SQL Server 2005 Database Engine assigns a seed value at random. For a specified seed value, the result returned is always the same.

Return Types

float

Remarks

Repetitive calls of RAND() with the same seed value return the same results.

For one connection, if RAND() is called with a specified seed value, all subsequent calls of RAND() produce results based on the seeded RAND() call. For example, the following query will always return the same sequence of numbers.

SELECT RAND(100), RAND(), RAND()

Examples

The following example produces four different random numbers that are generated by the RAND function.

DECLARE @counter smallint
SET @counter = 1
WHILE @counter < 5
   BEGIN
      SELECT RAND() Random_Number
      SET @counter = @counter + 1
   END
GO

See Also

Reference

Mathematical Functions (Transact-SQL)

Other Resources

Using RAND

Help and Information

Getting SQL Server 2005 Assistance