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Create or replace trigger trig_error
before insert or update or delete on emp
begin
     if to_char(sysdate,'DY') IN ('SAT','SUN') then
         raise_application_error(-20111,'No changes can be made on tuesday');
     end if;
end;
dbms_output.put_line('no changes can be done on SAT and SUN!!’);

但是得到这样的输出:警告:触发器创建时出现编译错误。

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