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How Do You Create A Unique Key Based On Existing Data?

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I just worked with a data set where I needed to create a unique key based on existing information where no unique key was set up as a field. I accomplished it by concatenating (using the & [concatenation] operator) several fields based on what I hypothesized and observed about their content.

I'm thinking there has to be a more automated way to discover the best unique key of existing fields and their data. I thought I'd post this as a challenge because I don't know the "right" (or better) answer.

Anyone have any ideas?

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