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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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