Use the RENAME COLUMN statement to rename a column in a table.
The RENAME COLUMN statement allows you to rename an existing column in an existing table in any schema (except the schema SYS).
To rename a column, you must either be the database owner or the table owner.
Other types of table alterations are possible; see ALTER TABLE statement for more information.
RENAME COLUMN table-Name.simple-Column-Name TO simple-Column-Name
RENAME COLUMN EMPLOYEE.MANAGER TO SUPERVISOR
ALTER TABLE t ADD COLUMN c1_newtype NEWTYPE
UPDATE t SET c1_newtype = c1
ALTER TABLE t DROP COLUMN c1
RENAME COLUMN t.c1_newtype TO c1