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CREATE TABLE state_lookup
(state      VARCHAR2(2),
  state_desc VARCHAR2(30)) TABLESPACE student_data;
ALTER TABLE state_lookup
  ADD CONSTRAINT pk_state_lookup PRIMARY KEY (state)
  USING INDEX TABLESPACE student_index;
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INSERT INTO state_lookup VALUES ('CA', 'California');
INSERT INTO state_lookup VALUES ('NY', 'New York');
INSERT INTO state_lookup VALUES ('NC', 'North Carolina');
    ÎÒÃÇͨ¹ýʵÏÖ¸¸×Ó¹ØϵÀ´±£Ö¤²ÎÕÕÍêÕûÐÔ£¬Í¼Ê¾ÈçÏÂ
 ---------------   Íâ¼ü×ֶδæÔÚÓÚStudents±íÖÐ
|State_lookup  |  ÊÇState×Ö¶Î
---------------   Ò»¸öÍâ¼ü±ØÐë²ÎÕÕÖ÷¼ü»òUnique×Ö¶Î
 |           Õâ¸öÀý×ÓÖУ¬ÎÒÃDzÎÕÕµÄÊÇState×Ö¶Î
 |           ËüÊÇÒ»¸öÖ÷¼ü×ֶΣ¨²Î¿´DDL£©
           /|\
 ---------------
|  Students    |
 ---------------
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    State_Lookup±íÖеÄÒ»¸öÖÝÃû¿ÉÒÔÔÚStudents±íÖгöÏÖ¶à´Î¡£ÓÐÐí¶àѧÉúÀ´×Ôͬһ¸öÖÝ£¬Ò»´Î£¬ÔÚ±íState_LookupºÍStudentsÖ®¼ä²ÎÕÕÍêÕûÐÔʵÏÖÁËÒ»¶Ô¶àµÄ¹Øϵ¡£
    Íâ¼üͬʱ±£Ö¤Students±íÖÐState×ֶεÄÍêÕûÐÔ¡£Ã¿Ò»¸öѧÉú×ÜÊÇÓиöState_lookup±íÖгÉÔ±µÄÖÝËõд¡£
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    1¡¢´´½¨±í
CREATE TABLE students
(student_id&n


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