复制SQL> DESC DBA_USERS;   NameNull?何查号    Type   ----------------------------------------- -------- ----------------------------  USERNAME                                  NOTNULL VARCHAR2(30)   USER_ID                                   NOTNULL NUMBER   PASSWORD                                           VARCHAR2(30)   ACCOUNT_STATUS                            NOTNULL VARCHAR2(32)   LOCK_DATE                                          DATE  EXPIRY_DATE                                        DATE  DEFAULT_TABLESPACE                        NOTNULL VARCHAR2(30)   TEMPORARY_TABLESPACE                      NOTNULL VARCHAR2(30)   CREATED                                   NOTNULLDATE  PROFILE                                   NOTNULL VARCHAR2(30)   INITIAL_RSRC_CONSUMER_GROUP                        VARCHAR2(30)   EXTERNAL_NAME                                      VARCHAR2(4000)  1.2.3.4.5.6.7.8.9.10.11.12.13.14.15.

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