select count(*) from ( select Author from au_Content where Author is not null and NodeID=66 or NodeID=65 group by Author ) tb 原理是先查出所有行数，再进行count。注意后面的tb不能省。 http://b...
select count(*) from ( select Author from au_Content where Author is not null and NodeID=66 or NodeID=65 group by Author ) tb 原理是先查出所有行数，再进行count。注意后面的tb不能省。 http://b...