Advanced Target Search

[landed]

How can I see records that dont have anything in a particular field, i tried "" but this didnt give me any results.
??
Thanks if you know this, an alternative would be to allow this field to be a sortable title field when displaying the list of targets...

Thanks

[landed]

I was also trying to sort lists on Country and so create a campaign per country, but I might have forgotten to insert a country so this doesnt get added to any target list.
Is there any way to see what emails in all my targets didnt get assigned to any list or didnt get emailed.

I tried looking in the database itself but I dont see any table for "targets" and this is far from ideal.

Is there a better way of doing what I am trying to do, i.e from contacts or targets select according to country and create a target list with them ?

Thank you.