oracle tips and tracks

1.在查看oracle里查看存储过程：
  ** desc user_source;
  ** select line|| ' ' || text from user_source where lower(name) ='存储过程名' order by line;

2.alert table ORDERS add index IDX_CUSTOMER(CUSTOMER_ID),
    add constraint FK_CUSTOMER foregin key(CUSTOMER_ID)
    references CUSTOMERS(ID);

3.