Oracle(00):sum count null 结果
摘要:
select sum(aa),sum(bb),count(bb),count(*),sum(aa+bb),sum(aa)+sum(bb) from (select 1 aa,null bb from dual union all select 2 aa,1 bb from dual) tt 结果为: 阅读全文
posted @ 2011-12-16 09:47 springsnow 阅读(373) 评论(0) 推荐(0) 编辑