-- https://docs.oracle.com/en/database/oracle/oracle-database/23/sqlrf/CREATE-TABLE.html
CREATE TABLE departments_demo
    ( department_id    NUMBER(4)   PRIMARY KEY DISABLE
    , department_name  VARCHAR2(30)
           CONSTRAINT  dept_name_nn  NOT NULL
    , manager_id       NUMBER(6)
    , location_id      NUMBER(4)
    , dn               VARCHAR2(300)
    ) ;