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So it's possible that the data you found that had empty strings may have had a different meaning than the data that had NULL values
True, though in general (not always) I'd say it's a bad idea to have a design with logic that behaves differently depending on whether a value is blank or null. That usually will result in code that is difficult to understand and maintain.
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-Jeff
Rome did not create a great empire by having meetings; they did it by killing all those who opposed them.