1. 创建临时表tmp

create table #Tmp (
		Field1 nvarchar(60),
		Field2 nvarchar(60),
		Field3 nvarchar(60),
		FieldCount int,
		CreatedAt int
	)

Field1,2,3表示用于分组的列；FieldCount记录每组个数，CreatedAt对应记录时间，一条记录对应一个时间




2. 将记录分组，插入到临时表

	insert #Tmp
    select t.Field1, t.Field2, t.Field3, count(*) FieldCount, min(CreatedAt)
	from Table_X t (nolock)
	where ...
	group by t.Field1, t.Field2, t.Field3

3. 查询，以CreatedAt排序

select * from #Tmp order by CreatedAt