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   alter table TABLE_NAME add constraint KEY_NAME primary key (TABLE_COLUMN);
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   alter table TABLE_NAME add constraint KEY_NAME primary key (TABLE_COLUMN) using index  tablespace TABLE_SPACE_NAME;
2.Ôö¼ÓÍâ¼ü
   alter table TABLE_NAME add constraint FK_NAME  foreign key (TABLE_COLUMN) references KEY_TABLE_NAME;
3.ʹÖ÷¼ü»òÍâ¼üʧЧ¡¢ÉúЧ
   alter table TABLE_NAME  disable(enable) constraint KEY_NAME;
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  select constraint_name,table_name,constraint_type,status from user_constraints;
  select constraint_name, constraint_type,search_condition, r_constraint_name  from user_constraints where table_name = upper('&table_name')
  select c.constraint_name,c.constraint_type,cc.column_name  
        from user_constraints c,user_cons_columns cc
        where c.owner = upper('&table_owner') and c.table_name = upper('&table_name')
        and c.owner = cc.owner and c.constraint_name = cc.constraint_name
        order by cc.position;
5¡¢É¾³ýÖ÷¼ü»òÍâ¼ü
  alter table TABLE_NAME  drop constraint KEY_NAME;
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    µ¥×Ö¶Îʱ£ºcreate table ±íÃû (col1  char(8),
                                 cno   char(4)  REFERENCE course);
    ¶à¸ö×Ö¶Îʱ,ÔÚ×îºó¼ÓÉÏ Foreign Key (×Ö¶ÎÃû) REFERENCE ±íÃû(×Ö¶Î)
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