请参见以下SQL语句：

SELECT datediff("d", MAX(invoice.date), Now) As Date_Diff
      , MAX(invoice.date) AS max_invoice_date
      , customer.number AS customer_number
FROM invoice 
    INNER JOIN customer 
        ON invoice.customer_number = customer.number
GROUP BY customer.number

如果添加以下内容：

HAVING datediff("d", MAX(invoice.date), Now) > 365

会简单地排除Date_Diff <= 365的行吗？

HAVING子句在这里应有什么作用？

编辑：我没有遇到这里所说的答案。mdb的副本位于http://hotfile.com/dl/40641614/2353dfc/test.mdb.html（无宏或病毒）。VISDATA.EXE用于执行查询。

EDIT2：我认为问题可能出在VISDATA，因为我通过DAO遇到了不同的结果。