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How do databases (mySQL if a particular example is important) determine the size of the column needed to store an ENUM?
Is it something simple like a single byte for less than 256 enum options, etc.?
MySQL Manual says ‘1 or 2 bytes, depending on the number of enumeration values’. If the ENUM has less than 256 possible values, it uses 1 byte, otherwise 2.
See: 10.5. Data Type Storage Requirements