Update SQL with consecutive numbering

Question

I want to update a table with consecutive numbering starting with 1. The update has a where clause so only results that meet the clause will be renumbered. Can I accomplish

Answer 1

In oracle this works:

update myTable set rowColum = rownum
where something = something else

http://download.oracle.com/docs/cd/B19306_01/server.102/b14200/pseudocolumns009.htm#i1006297