1. Many languages allow users to define new enumerated types . 2. In type theory, enumerated types are often regarded as tagged unions of unit types. 3. Some databases support enumerated types directly. 4. An enumerated type can be seen as a degenerate case : a tagged union of unit types. 5. MySQL provides an enumerated type ENUM with allowable values specified as strings when a table is created. 6. Enumerated types are Comparable, using the internal integer; as a result, they can be sorted.7. Enumerated types are an important feature of the language; they can have type parameters and be recursive.8. Variables declared to be of enumerated type cannot be assigned to variables of a different enumerated type without casting. 9. Variables declared to be of enumerated type cannot be assigned to variables of a different enumerated type without casting. 10. Some compilers warn if an object with enumerated type is assigned a value that is not one of its constants.
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