在SQL数据库中查找最近的常客

我需要在数据库中找到常客名单

有两个重要的表格：人口统计和访问

这就是我到目前为止所做的：

SELECT Demographics.[First Name], Demographics.[Last Name], Demographics.ID
FROM Demographics INNER JOIN Visits ON (Demographics.ID=Visits.ID)
WHERE Visits.[Visit Date] > #1/1/2019#
GROUP BY Demographics.[First Name], Demographics.[Last Name], Demographics.ID
HAVING COUNT(Visits.ID) >=5;

它运行并返回去年访问过5次或以上的用户。然而，我真正想要的是访问过5次或更多次的人，并且去年至少访问过一次。我假设答案涉及一个ORDERBY子句并删除WHERE子句，但我不确定如何表达它

我在Windows 7上使用Microsoft Access我知道。。。如果有帮助的话

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谢谢。

经过一段时间的思考，我相信我能够回答我自己的问题

以下是我的解决方案：

SELECT Demographics.[First Name], Demographics.[Last Name], Demographics.ID
FROM Demographics INNER JOIN Visits ON (Demographics.ID=Visits.ID)
WHERE Demographics.ID IN 
(
SELECT Demographics.[First Name], Demographics.[Last Name], Demographics.ID
FROM Demographics INNER JOIN Visits ON (Demographics.ID=Visits.ID)
WHERE Visits.[Visit Date] > #1/1/2019#
GROUP BY Demographics.[First Name], Demographics.[Last Name], Demographics.ID #parts of this line are superfluous
)
GROUP BY Demographics.[First Name], Demographics.[Last Name], Demographics.ID
HAVING COUNT(Visits.ID) >=5;

SELECT d.[First Name], d.[Last Name], d.ID
FROM Demographics as d INNER JOIN
     Visits as v
     ON d.ID = v.ID
GROUP BY d.[First Name], d.[Last Name], d.ID
HAVING COUNT(Visits.ID) >= 5 AND
       MAX(v.[Visit Date]) > #1/1/2019#;

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子查询检查过去一年的访问，外部查询检查访问总数。

我认为这是一个更简单的解决方案：

SELECT Demographics.[First Name], Demographics.[Last Name], Demographics.ID
FROM Demographics INNER JOIN Visits ON (Demographics.ID=Visits.ID)
WHERE Demographics.ID IN 
(
SELECT Demographics.[First Name], Demographics.[Last Name], Demographics.ID
FROM Demographics INNER JOIN Visits ON (Demographics.ID=Visits.ID)
WHERE Visits.[Visit Date] > #1/1/2019#
GROUP BY Demographics.[First Name], Demographics.[Last Name], Demographics.ID #parts of this line are superfluous
)
GROUP BY Demographics.[First Name], Demographics.[Last Name], Demographics.ID
HAVING COUNT(Visits.ID) >=5;

SELECT d.[First Name], d.[Last Name], d.ID
FROM Demographics as d INNER JOIN
     Visits as v
     ON d.ID = v.ID
GROUP BY d.[First Name], d.[Last Name], d.ID
HAVING COUNT(Visits.ID) >= 5 AND
       MAX(v.[Visit Date]) > #1/1/2019#;

我添加了表别名，因此查询更易于编写和读取。更简单的是将逻辑从何处转移到拥有