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£¨1£©±íemployeesºÍdepartment´æÔÚ²ÎÕÕÍêÕûÐÔÔ¼Êø£¬ÔÚ±íemployeesÖвåÈë¼Ç¼£¨‘70’£¬‘999’£©department_idΪ‘999’ʱ£¬department±íÖл¹²»´æÔÚdepartment_idΪ‘999’µÄ¼Ç¼£¬ËùÒÔÎ¥±³Á˲ÎÕÕÍêÕûÐÔÔ¼Êø,³öÏÖ“Integrity constraint violation error”ÌáʾÐÅÏ¢¡£
 UPDATE employees  SET department_id = 999  WHERE employee_id = 170;
-- Integrity constraint violation error
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CREATE OR REPLACE TRIGGER constr_emp_trig
AFTER UPDATE ON employees
FOR EACH ROW
BEGIN
INSERT INTO departments
VALUES (999, 'dept999', 140, 2400);
END;
/
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3.Í£Ö¹Distributed Transaction Coordinator·þÎñ
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SQL> grant select on sys.x$bh to t1;
grant select on sys.x$bh to t1
ERROR at line 1:
ORA-02030: can only select from fixed tables/views
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spool portal_schema.sql
SELECT DBMS_METADATA.GET_DDL('TABLE',u.table_name)
from USER_TABLES u;
SELECT DBMS_METADATA.GET_DDL('INDEX',u.index_name)
from USER_INDEXES u;
spool off;
2. ......
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