use TSQL to do it. there's a RAND() function.
Syntax would be something like:
update tablename
set randomfield=RAND(primarykey)*20000000000 -- RAND() will return a number between 0 and 1
cast it to integer if need be.
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Your lack of planning does not constitute an emergency on my part...unless you're my manager...or a director and above...or a really loud-spoken end-user..All right - what was my emergency again?