sqlserver中有if exists_object(tablename) 可以进行判断表是否存在,进行表的drop处理
oracle中不支持,写了如下匿名块实现同样的功能
declare
num int;
begin
select to_char(sysdate-1,'yyyymmdd')into dd from dual;
select count(1) into num from user_tables where table_name='MAZONGXIAO_1';
if num>0 then
execute immediate 'drop table MAZONGXIAO_1';
end if;