. 以下哪句分组统计查询语句可能正确

. 以下哪句分组统计查询语句可能正确

A.. select a1,sum(a3) from ab where a2>0 and count(1)>1 group by a1;

B.. select a1,sum(a3) from ab group by a1 having a2>0 and count(1)>1;

C.. select a1,sum(a3) from ab where a2>0 and count(1)>1 group by a1;

D.. select a1,sum(a3) from ab where a2>0 group by a1 having count(1)>1;

正确答案是D