update random numbers for top 100 rows in sql?

Question

I need to update random numbers for top 100 rows (a field) in sql. random number should be less than 100. how to do that?

Answer 1

In SQL 2008

update top (100) MyTable
set MyField = cast(cast(crypt_gen_random(1) as int) * 100.0 / 256 as int)

I believe the same will work in SQL 2005.

[Edit]

If it doesn't work in SQL 2005, you can do this:

update top (100) MyTable
set MyField = abs(cast(newid() as binary(6)) % 100)