How to update a Table Column with a Shuffled numbers from within a range

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SQL-Server-2008

I am trying to update a Table Column with shuffled numbers from a given range. I have worked on the following query but it is generating ~~DUPLICATE~~ numbers. I need help to remove duplicates.

Please help. I am using SQL-server-2008

SQL

UPDATE TAB_EXAM_FORMS
SET
	RNO_CODE = CAST(RAND(CHECKSUM(NEWID())) * 10 AS INT)+1 
	WHERE  SESSION_ID='46'

.

Please note 10 is the range in the above query. and Session_Id is the filter for the rows of the table.

Thanks and Regards

Posted 29-Apr-15 4:24am

Jamshaid Riaz

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Herman<T>.Instance · Answer 1 · 2015-04-30T05:37:00

If you use a SQL Server Management Tool and run the query

SQL

select CAST(RAND(CHECKSUM(NEWID())) * 10 AS INT)+1

about 20 times you could simply see the result is a random value between 1 and 10. So it is very possible you get duplicates.
Enlarge your range or only use the NewID().

If you would do:

SQL

DECLARE @generatedValue INT
SET @generatedValue = CAST(RAND(CHECKSUM(NEWID())) * 10 AS INT)+1

You have a variable which you can test for.
But why you have to remove duplicate number if you use an UPDATE statement. Is there somewhere an INSERT statement available in your code that causes the problem?