Question

请帮忙......

我正在尝试使用SQL从我的网站www.mentallica.co.il获取流量数据问题是当我使用两个或更多时，我的左连接查询返回不同的值。

SELECT ISNULL(SUM([TrafficDay].UniqueTraffic), 0) AS TrafficDay,
       [Topics].topicNumber
FROM [Topics]
LEFT JOIN [Traffic] AS TrafficDay
    ON ([TrafficDay].Date >= '10/16/2013'
        AND [TrafficDay].Date <= '10/16/2013')
   AND [TrafficDay].TopicNumber = [Topics].TopicNumber
GROUP BY [Topics].TopicNumber

将返回TrafficDay实际值

问题查询是

SELECT ISNULL(SUM([TrafficDay].UniqueTraffic), 0) AS TrafficDay,
       ISNULL(SUM([TrafficWeek].UniqueTraffic), 0) AS TrafficWeek,
       [Topics].topicNumber
FROM [Topics] 
LEFT JOIN [Traffic] AS TrafficDay
    ON ([TrafficDay].Date >= '10/16/2013'
   AND [TrafficDay].Date <= '10/16/2013')
   AND [TrafficDay].TopicNumber = [Topics].TopicNumber
LEFT JOIN [Traffic] AS TrafficWeek
    ON ([TrafficWeek].Date > '10/09/2013'
        AND [TrafficWeek].Date < '10/16/2013')
   AND [TrafficWeek].TopicNumber = [Topics].TopicNumber
GROUP BY [Topics].TopicNumber

这将为TrafficDay

返回不同（更大）的值

为什么？如何获得TrafficDay和TrafficWeek的实际值？

任何解决方案都会很棒！如何根据其他表值加入同一个表...

Answer 1

您是否尝试通过右键单击任何视图并选择“新视图”来临时创建新视图，然后将查询复制并粘贴到下面的框中。从那里你将有一些查询的Access视图，并且可以更好地可视化和更改您的连接，即表之间的箭头。只是一个建议。有时对我有用。祝你好运。

Join查询返回不同的结果

1 个答案: