> It may be a silly question, but why a SELECT * will brake 
> because an unused column was dropped?

For the same reason that SELECT * will break if you use it in a view, run
the view, then change the underlying schema. The "*" gets dereferenced to
actual columns in the execution plan, which gets cached. If the columns
change, the execution plan may no longer be valid.

Dave Watts, CTO, Fig Leaf Software
http://www.figleaf.com/

Fig Leaf Software provides the highest caliber vendor-authorized
instruction at our training centers in Washington DC, Atlanta,
Chicago, Baltimore, Northern Virginia, or on-site at your location.
Visit http://training.figleaf.com/ for more information!

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