The Country Field has Canada, you change it to USA, then to no text string. Does this action of deleting the text string make the field null or does it make it contain "" - an empty string?
Reply from Richard Rost:
It would be EMPTY. A NULL value says, "there was never data in this field." An EMPTY string says, "there is no data in this string now, but there might have been at one time."
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