SQL Server-按所有组返回的记录数进行汇总

试试这个：

select dateCol,       fkid,        sector,       sum(value) over (partition by fkid, sector) /       (select count(distinct dateCol) from @MyTable where fkid = t.fkid)from @MyTable t

或者

select fkid,        sector,       sum(value) /       (select count(distinct dateCol) from @MyTable where fkid = t.fkid)from @MyTable tgroup by fkid, sector