中科新闻网晚上关节痛吃姜片:select distinct id ,num=sum(cast((num) as int) from sy order by id desc
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有什么地方错了，指出谢谢！
应该分组查询
select distinct id ,Totalnum=count(num)
from sy group by id order by id desc
如果num不是int可以
select distinct id ,nums=count(cast((num) as int)
from sy group by id order by id desc
sum(cast((num) as int)
int 是保留字。换个名字试试
select distinct id ,num=sum(cast((num) as int) from sy order by id desc
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