On 23 Dec 2010, at 12:19am, Mark wrote:

> ran the first example, came back with lots of lines, second test with the 
> just the 10 returned
> 9 lines as 0:  the second line as 2:3832,  don't understand the 
> purpose/meaning of this

If that's 2 in the first column then those fields which you think contain 
blanks actually have two characters in them.

So is that a legitimate thing for your cn to have ?  Are their any legitimate 
values for cn which are less than three characters long ?  If not, you can run 
something like

UPDATE Aircraft SET CN = '' where length(cn) < 3

and that will make sure they're all really blank.

Simon.
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