在Access中选择Distinct？语法错误

Question

我有这个SQL：

SELECT (Min(Time_In) & " to " & Max(Time_Out)) AS [Week Of],
 Round((Sum(DATEDIFF("n", Time_In, Time_Out))/Count(DATEDIFF("n", Time_In, Time_Out))),2) AS [Avg Min of Jog]
FROM SomeTable
WHERE len(Time_In) > 0 AND len(Time_Out) > 0 
AND #01/01/2012# <= Time_In AND #12/31/2012# >= Time_In
GROUP BY DatePart('ww',Time_In);

选择每周慢跑的平均时间。我还要计算每周慢跑多少次，我想通过计算jog_id SomeTable jog_id可能有一个SELECT (Min(Time_In) & " to " & Max(Time_Out)) AS [Week Of], Round((Sum(DATEDIFF("n", Time_In, Time_Out))/Count(DATEDIFF("n", Time_In, Time_Out))),2) AS [Avg Min of Jog], Count(distinct jog_id) AS [Num Jogs] FROM SomeTable WHERE len(Time_In) > 0 AND len(Time_Out) > 0 AND #01/01/2012# <= Time_In AND #12/31/2012# >= Time_In GROUP BY DatePart('ww',Time_In); 的5个条目来计算。

我试过了：

Syntax error (missing operator) in query expression 'Count(distinct jog_id)'.

但是这给了我{{1}}

我错过了什么？

Answer 1

如果不使用子查询，则无法在Access中执行此操作 EX：

SELECT Count(*)
FROM
(SELECT DISTINCT Name FROM table1);

Here是关于该主题的详细文章：

Answer 2

Access几乎在所有情况下都拒绝行事，其中一个是Count(distinct x)的支持。