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1.1 ¸ÅÄ
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1.2 ½¨Á¢£º
1.2.1 ½¨Á¢ÆÕͨ¾Û¼¯
--½¨Á¢¾Û¼¯personnel£º
CREATE CLUSTER personnel 
     ( department_number  NUMBER(2) ) 
     SIZE 512 
     STORAGE (INITIAL 100K NEXT 50K);
--½¨Á¢¾Û¼¯±íemp:
CREATE TABLE emp 
     (empno     NUMBER        PRIMARY KEY, 
      ename     VARCHAR2(10)  NOT NULL 
                CHECK (ename = UPPER(ename)), 
       job       VARCHAR2(9), 
       mgr       NUMBER        REFERENCES scott.emp(empno), 
       hiredate  DATE          
         CHECK (hiredate < TO_DATE ('08-14-1998', 'MM-DD-YYYY')), 
     sal       NUMBER(10,2)  CHECK&nb


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