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   grant select ,delete,update,insert on emp to ams;
   µ«ÊÇΪÁËʵÏÖ¸ü¸´Ôӵݲȫģʽ£¬±ÈÈçÏÞÖÆ¶Ôij¸ö±íÒªÐ޸ĵÄÊý¾Ý£¬¾ÍÐèÒªÓõ½´¥·¢Æ÷£¬±ÈÈ磬ֻÓÐÔÚ9£º00µ½17£º00²ÅÄܸıäÊý¾Ý¿âEMP±í¶ÔÊý¾Ý¿â±í²Ù×÷
   create or replace trigger triger_stat_before
    before insert or update or delete on emp
    
    declare
    -- local variables here
    begin
     if (to_char(sysdate,'HH24') not between '9' and '17') then
       RAISE_APPLICATION_ERROR(-20101,'·Ç¹¤×÷ÈÕʱ¼ä');
     end if;
   end triger_before;
   2£¬ÊµÏÖÊý¾ÝÉ󼯣¬¼àÊÓ·Ç·¨ºÍ¿ÉÒɵÄÊý¾Ý»î¶¯£¬oracle ±¾ÉíÌṩÁËÉ󼯹¦ÄÜ¡£Èç¶Ôemp DML ²Ù×÷ÒÔºó£¬
   °ÑSQL²Ù×÷µÄÐÅÏ¢(Óû§£¬Ê±¼äµÈ)дÈë×ֵ䡣µ«ÊÇÖ»ÄÜÉó¼Æsql ²Ù×÷£¬²»ÄܼÇÔØÊý¾Ý±ä»¯¡£Èç¹ûÒª¼ÇÔØÊý¾Ý
   ±ä»¯±ØÐëʹÓÃDML´¥·¢Æ÷¡£±ÈÈ繤×ʱ仯дÈëÊý¾Ý×Öµä±í¡£
   --´´½¨×Öµä±í
      drop table EMP_CHANGE;
   create table EMP_CHANGE(
    CNAME       VARCHAR2(200),
    OLDSAL      NUMBER,
    NEWSAL      NUMBER,
    CHANGE_TIME TIMESTAMP(6)
   )
  --´´½¨´¥·¢Æ÷
  create or replace trigger triger_row_after
   after update of sal  on emp 
   for each row
 


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