Oracle(00):sum count null 结果
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:
SUM(AA) | SUM(BB) | COUNT(BB) | COUNT(*) | SUM(AA+BB) | SUM(AA)+SUM(BB) |
---|---|---|---|---|---|
3 | 1 | 1 | 2 | 3 | 4 |
posted on 2011-12-16 09:47 springsnow 阅读(373) 评论(0) 编辑 收藏 举报