RAND (Transact-SQL)

 

THIS TOPIC APPLIES TO:yesSQL Server (starting with 2008)yesAzure SQL DatabaseyesAzure SQL Data Warehouse noParallel Data Warehouse

Returns a pseudo-random float value from 0 through 1, exclusive.

Topic link icon Transact-SQL Syntax Conventions

  
RAND ( [ seed ] )  

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

float

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()   

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  

Mathematical Functions (Transact-SQL)

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