ð Not NULL
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| Places a constraint where the column MUST contain a value other than NULL before the row will be saved.
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| Specifies that the data values will be case sensitive.
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| Specifies that the data values MUST be unique.
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| Enter name for this index
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| A 1-18 character alpha-numeric name for the index.
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| NOTE: Valid names must start with an alpha character and can include the following symbols: Letters (A-Z); Numbers (0-9); # (pound sign); _ (underscore); $ (dollar sign); % (percent sign). Spaces are NOT permitted.
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