sql - 用于计算平均每月独立访问者的 MS SQL 查询

Question

我进行了 MSSQL 查询，计算过去 30 天的总唯一 IP 地址和总 IP 记录。

SELECT count(IPAddress) AS totalPageHits, count(DISTINCT IPAddress) AS totalVisitors, count(DateTime)
FROM recordTable
WHERE DateTime > GETDATE()-30

现在我很难计算平均每日页面点击量和平均每日独立访问者。我尝试使用AVG，但它给了我一条错误消息，说“操作数数据类型 varchar 对 avg 运算符无效。”
任何帮助是极大的赞赏。

Answer 1

SELECT  AVG(HitCount) as AverageHits,
    AVG(UniqueHitCount) As AverageUniqueHits
FROM
(
SELECT  COUNT(IPAddress) as HitCount,
        COUNT(DISTINCT IPAddress) as UniqueHitCount,
        DATEDIFF(d, GETDATE(), DateTime) as Day
FROM tblHitCounter
WHERE DateTime > GETDATE() - 30
GROUP BY DATEDIFF(d, GETDATE(), DateTime)
) sub

Answer 2

您需要按天分组，然后取平均值：

select avg(totalPageHits) as avgDailyTotalPageHits,
       avg(totalVisitors) as avgDailyTotalVisitors
from (SELECT cast(DateTime as date) as thedate,
             count(IPAddress) AS totalPageHits,
             count(DISTINCT IPAddress) AS totalVisitors, count(DateTime) as cnt
      FROM recordTable
      WHERE DateTime > GETDATE()-30
      group by cast(DateTime as date)
     ) t