On 22 Dec 2010, at 11:55pm, CDN Mark wrote:

> I tried using a statement
> UPDATE Aircraft SET CN = "*" where CN = "";
> as a test which worked, but not for all records.  I don't know if the blank 
> fields are empty or null

Do a

SELECT length(CN),hex(CN) FROM Aircraft

if that produces too many lines do

SELECT length(CN),hex(CN) FROM Aircraft WHERE length(CN)<3 LIMIT 10

Simon.
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