通过 group by 和 joins 获取多个表的多个列的总和答案

【问题标题】：Getting Sum of multiple columns of multiple tables through group by and joins通过 group by 和 joins 获取多个表的多个列的总和
【发布时间】：2012-03-09 05:35:42
【问题描述】：

我正在使用以下查询使用左连接从两个表中获取多个列的总和。但是mysql显示“Error Code: 1111. Invalid use of group function”的错误请指出我哪里出错了？

SELECT  url as Domain,
  A.advertiserid as advertiserid,
  count(A.salesId) as Impressions,
  Sum(IF(A.click1datetime IS NULL,0,1)) AS Clicks,
  sum(count(B.order_id)) as Sales,
  sum(sum(B.order_amount)) as SalesAmount,

  FROM  ClickRecords A
  left join SalesDetail B
  on A.salesId= B.salesId
  where
  A.advertiserid = 52 AND
  datetime >= '2012-03-01' AND
  datetime < '2012-03-02'
  group by advertiserid, Domain
  order by impressions desc;

【问题讨论】：

这是因为您已经嵌套了总和 - SUM(COUNT 和 SUM(SUM 无效。您能否提供更多关于您的表如何相互关联以及为什么需要SUM(SUM(B.order_amount)) 而不是SUM(B.order_amount) 以及SUM(COUNT(B.order_id)) 的信息？

标签： mysql sql

【解决方案1】：

如上所述，您不能嵌套聚合函数 - 即。 sum(sum(value)) 无效。

我想你想要：

SELECT url as Domain,
       A.advertiserid as advertiserid,
       count(distinct A.salesId) as Impressions,
       count(distinct case when A.click1datetime IS NOT NULL then A.salesId end) 
            AS Clicks,
       count(B.order_id) as Sales,
       sum(B.order_amount) as SalesAmount,
FROM ClickRecords A
left join SalesDetail B on A.salesId= B.salesId
where A.advertiserid = 52 AND
      datetime >= '2012-03-01' AND
      datetime < '2012-03-02'
group by advertiserid, Domain
order by impressions desc;

注意 count(distinct ...) 用于 ClickRecords 值 - sum 或非独特 count 根据非空记录的数量将值相加，这些记录可以乘以 SalesDetail 记录（其中有多个每点击记录）。

【讨论】：

【解决方案2】：

您不能将聚合函数用作其他聚合函数的参数（例如：sum(count(B.order_id))）。

【讨论】：