The syntax for CREATE TYPE (Structured Form) is similar to that for the CREATE TYPE (Distinct Form) statement.
The major distinguishing characteristics are the following:
- The AS attribute_name list with an optional INSTANTIABLE specification.
For CREATE TYPE (Distinct Form), the corresponding clause is the AS predefined_data_type clause.
- The mandatory NOT FINAL specification.
For CREATE TYPE (Distinct Form), the mandatory specification is FINAL.
- The ability to create constructor method signatures, which you cannot do for distinct types.