generate seemingly random unique numeric ID in SQL Server

Question

I need to use SQL Server to generate seemingly random unique 8-digit numeric ID (can pad zeros at front). Is there a built-in functionality for this? I saw

Answer 1

USE the below query to create 8 digit randow unique number.

SELECT CAST(RAND() * 100000000 AS INT) AS [RandomNumber]

To avoid exception while inserting of existing number into DB use below query.

IF NOT EXIST(SELECT UniqueColumnID FROM TABLENAME WHERE UniqueColumnID = @RandowNumber)
BEGIN
    --Insert query using  @RandowNumber.
END