创建外部表例子

The following SQL statements create an external table named admin_ext_

employees in the hr schema and load data from the external table into

the hr.employees table.

CONNECT  /  AS SYSDBA;
-- Set up directories and grant access to hr 
CREATE OR REPLACE DIRECTORY admin_dat_dir
    AS '/flatfiles/data'; 
CREATE OR REPLACE DIRECTORY admin_log_dir 
    AS '/flatfiles/log'; 
CREATE OR REPLACE DIRECTORY admin_bad_dir 
    AS '/flatfiles/bad';
GRANT READ ON DIRECTORY admin_dat_dir TO hr; 
GRANT WRITE ON DIRECTORY admin_log_dir TO hr; 
GRANT WRITE ON DIRECTORY admin_bad_dir TO hr;
-- hr connects. Provide the user password (hr) when prompted.
CONNECT hr
-- create the external table
CREATE TABLE admin_ext_employees
                   (employee_id       NUMBER(4), 
                    first_name        VARCHAR2(20),
                    last_name         VARCHAR2(25), 
                    job_id            VARCHAR2(10),
                    manager_id        NUMBER(4),
                    hire_date         DATE,
                    salary            NUMBER(8,2),
                    commission_pct    NUMBER(2,2),
                    department_id     NUMBER(4),
                    email             VARCHAR2(25) 
                   ) 
     ORGANIZATION EXTERNAL 
     ( 
       TYPE ORACLE_LOADER 
       DEFAULT DIRECTORY admin_dat_dir 
       ACCESS PARAMETERS 
       ( 
         records delimited by newline 
         badfile admin_bad_dir:'empxt%a_%p.bad' 
         logfile admin_log_dir:'empxt%a_%p.log' 
         fields terminated by ',' 
         missing field values are null 
         ( employee_id, first_name, last_name, job_id, manager_id, 
           hire_date char date_format date mask "dd-mon-yyyy", 
           salary, commission_pct, department_id, email 
         ) 
       ) 
       LOCATION ('empxt1.dat', 'empxt2.dat') 
     ) 
     PARALLEL 
     REJECT LIMIT UNLIMITED;
-- enable parallel for loading (good if lots of data to load)
ALTER SESSION ENABLE PARALLEL DML;
-- load the data in hr employees table
INSERT INTO employees (employee_id, first_name, last_name, job_id,
manager_id,
                       hire_date, salary, commission_pct,
department_id, email) 
            SELECT * FROM admin_ext_employees;

查询结果：

SQL>    SELECT * FROM admin_ext_employees;
                                                                                                                                                                           Database Freespace Summary
        361 Mark                 Jasper                    SA_REP            145 17-MAY-01       8000             .1            80 mjasper
        362 Brenda               Starr                     AD_ASST           200 17-MAY-01       5500              0            10 bstarr
        363 Alex                 Alda                      AC_MGR            145 17-MAY-01       9000            .15            80 aalda
        402 Abby                 Applegate                 IT_PROG           103 17-MAY-01       9000             .2            60 aapplega
        403 Carol                Cousins                   AD_VP             100 17-MAY-01      27000             .3            90 ccousins
        404 John                 Richardson                AC_ACCOUNT        205 17-MAY-01       5000              0           110 jrichard
6 rows selected.
SQL>