简单sql语句
comment表
id newId commenttext isDelete
1   2     aaaaa         0
2   2     bbbbb         0
3   2     ccccc         0
4   2     ddddd         1 
5   3     fffff         0
查出newId=2  一共回复数和不包含删除的回复数

newid replycount replycountall
2         3          4
------解决方案--------------------
select [newId],replycount =sum(case when isDelete=1 then 0 else 1 end),count(1) replycountall from tb