Creates a domain definition.

    A domain defines the set of values, character set, collating
    sequence, and formatting clause that a column in a table can
    have. The CREATE DOMAIN statement specifies the set of values by
    associating a data type with a domain name.

    There are two ways to specify a domain definition:

    o  With a domain name, data type, and any combination of the
       following optional clauses:

       -  Default value

       -  Stored name

       -  Collating sequence

       -  Formatting clauses such as EDIT STRING or QUERY HEADER

    o  With the FROM clause and a repository path name that refers to
       a field already defined in the repository

    When the CREATE DOMAIN statement executes, SQL adds the domain
    definition to the database.

    If you attached to the database with the PATHNAME specification,
    the domain definition is also added to the repository.

    You can refer to a domain instead of an SQL data type in the
    CREATE and ALTER TABLE statements, and in formal parameter
    declarations in functions and procedures. If the domain has to
    change, you need only change that one domain definition (using
    the ALTER DOMAIN statement) to change all the tables. This
    ability makes it easier to keep applications consistent.

    A domain can be referenced in the following locations:

    o  CREATE, ALTER and DROP DOMAIN statements

    o  CREATE and ALTER TABLE statements as the data type for a
       column

    o  CREATE and ALTER MODULE statements as the data type of a
       routine parameter, or the data type of declared variable

    o  CREATE FUNCTION statement as the data type of a function
       parameter or function result

    o  CREATE PROCEDURE statement as the data type of a procedure
       parameter

    o  CREATE and ALTER SYNONYM statement as the base object for a
       synonym

    o  as the datatype of a CAST expression

    o  as a data type of a DECLARE variable statement in interactive
       SQL

    o  as the source in the EDIT USING clause of the SELECT and PRINT
       statements in interactive SQL. The EDIT STRING is inherited
       from that domain.