从 2 个表按天分组

Question

我有 2 个表：“订单”和“访问”。在订单表中，我保存了有关订单的一些详细信息，包括“userIP”和“orderDate”。在访问表中，每次用户访问我的网页时，我都会保存详细信息，包括“userIP”和“visitDate”。我正在使用 ASP.NET 和 SQL SERVER 2005。 我想创建一个统计表，我保存了访问的用户数量和订购 BOTH GROUPED BY DAY 到目前为止的用户数量：

  select count(userIP) as NumOfOrders,
         dateadd(dd, datediff(dd, 0, orderDate),0) as Date
    from Orders
group by dateadd(dd, datediff(dd, 0, orderDate), 0)

这很好用，给我按天分组的订单数量， 但是我如何将按天分组的总访问次数添加到此？

Answer 1

我会这样做：

SELECT v.userIP, NumOfVisits, NumOfOrders, v.Date
FROM (
    SELECT userIP, count(*) as NumOfVisits,
         dateadd(dd, datediff(dd, 0, visitDate),0) as Date
    FROM visits
    GROUP BY userIP, dateadd(dd, datediff(dd, 0, orderDate), 0)) v
LEFT JOIN (
    SELECT userIp, count(*) as NumOfOrders,
         dateadd(dd, datediff(dd, 0, orderDate),0) as Date
    FROM orders
    GROUP BY UserIP, dateadd(dd, datediff(dd, 0, orderDate), 0)) o
 ON o.UserIP = v.UserIP
    AND o.Date = v.Date

你的结果应该是这样的：

78.34.5.11 | 3 | 1 | 2009.10.06
78.34.5.19 | 9 | 0 | 2009.10.06

如果你不需要按用户IP分组，你可以这样做：

SELECT NumOfVisits, NumOfOrders, v.Date
FROM (
    SELECT count(*) as NumOfVisits,
         dateadd(dd, datediff(dd, 0, visitDate),0) as Date
    FROM visits
    GROUP BY dateadd(dd, datediff(dd, 0, visitDate), 0)) v
LEFT JOIN (
    SELECT count(*) as NumOfOrders,
         dateadd(dd, datediff(dd, 0, orderDate),0) as Date
    FROM orders
    GROUP BY dateadd(dd, datediff(dd, 0, orderDate), 0)) o
 ON o.Date = v.Date

您的结果将如下所示：

12 | 1 | 2009.10.06

Answer 2

SELECT COALESCE(O1.Date, V1.Date) Date,
       COALESCE(O1.NumOfOrders, 0) NumOfOrders,
       COALESCE(V1.TotalVisits, 0) TotalVisits
FROM 
     (select dateadd(dd,0, datediff(dd, 0, O.orderDate)) Date,
             count(O.userIP) NumOfOrders
        from Orders O
    group by dateadd(dd,0, datediff(dd, 0, O.orderDate))) O1
FULL JOIN
     (select dateadd(dd,0, datediff(dd, 0, V.visitDate)) Date,
             count(V.userIP) TotalVisits
        from Visits V
    group by dateadd(dd,0, datediff(dd, 0, V.visitDate))) V1
on O1.Date = V1.Date