declare @gourpmi tinyint --按几分钟分组

set @gourpmi = 5

select cast(floor(cast(时间 as float)2460/gourpmi)*gourpmi/60/24 as smalldatetime),SUM(字段),Count(字段) from tb group by cast(floor(cast(时间 as float)2460/gourpmi)*gourpmi/60/24 as smalldatetime)