hi there,

thanks Simon and Igor for your help on this a few weeks ago, but I need an 
addition to

UPDATE Aircraft SET CN = '*' where CN = '' or CN is null;

what I need to do is replace blank fields in a specific row, sort of
a double where where statement as in:

UPDATE Aircraft SET CN = '*' where CN = '' or CN is null where (primary key) 
is xyz

What I'm trying to do is update a database, but the users also have an 
automated update system
that apparently if it finds any blank fields in the row, updates the whole 
row, thereby overwriting
what I've replaced.  I thought if I could at least replace the blank fields 
with something, it should
prevent the overwriting.  I don't know which fields are blank, every user 
will be different, so the
plan was to update the fields I want to, insert text/symbol into the blank 
fields and leave the others
alone.  I realize that because I don't know which fields are empty/blank I'm 
going to have to create
a statement for every column I'm not updating to, there are only 10 columns 
altogether and I'll
typically be updating to at least 5 of them.

hope this is clear and mtia
Mark

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