Question

如果某个国家/地区的小部件属于多个类别，我正在尝试按分组获取计数1。

为了更好地解释它，这是我到目前为止的代码：

select c.Name As Country, w.Description As WidgetName, cat.Description As Category,
  COUNT (wc.Id)AS Clicks  
  from ManufacturerWidgets mw
 join WidgetClicks wc on mw.Id = wc.ManufacturerWidgetId
 join Products p on   wc.ProductId = p.Id
 join Countries c on mw.CountryId = c.Id
 join Widgets w on w.Id = mw.WidgetId
 join Categories cat on cat.Id = p.CategoryId
 where mw.Enabled = 1 and  mw.ManufacturerId = 17 and wc.CreatedAt >= '2013-01-01 00:00:00.000' and wc.CreatedAt <= '2013-07-05 23:59:00.000'
 GRoup By wc.WidgetImpressionId, c.Name,  w.Description,  cat.Description
 HAVING wc.WidgetImpressionId > 0
 order by  c.Name, w.Description, cat.Description

这将返回例如：

County   WidgetName   Category    Clicks

Austria  onebysix     computing   1
Austria  onebysix     computing   4
Austria  onebysix     printing    1
Austria  onebysix     printing    3
Austria  onebysix     printing    2

我需要返回的是每个类别的交互：

Austria  onebysix     computing   4  - this would be 1 not 4

我需要按类别对它们进行分组，以便最终结果为：

Austria  onebysix     computing   2
Austria  onebysix     printing    3

Answer 1

从GROUP BY中删除wc.WidgetImpressionID。这是添加额外级别的分组，恰好是所需结果的计数

将COUNT更改为COUNT(wc.WidgetImpressionID)，分别为2和3

HAVING应为HAVING COUNT(wc.WidgetImpressionID) > 0。在你的代码中，它就像一个WHERE子句过滤器，因为它在GROUP BY中（参见上面的第一点）

select c.Name As Country, w.Description As WidgetName, cat.Description As Category,
  COUNT (wc.WidgetImpressionID) AS Clicks  
  from ManufacturerWidgets mw
 join WidgetClicks wc on mw.Id = wc.ManufacturerWidgetId
 join Products p on   wc.ProductId = p.Id
 join Countries c on mw.CountryId = c.Id
 join Widgets w on w.Id = mw.WidgetId
 join Categories cat on cat.Id = p.CategoryId
 where mw.Enabled = 1 and  mw.ManufacturerId = 17 and wc.CreatedAt >= '2013-01-01 00:00:00.000' and wc.CreatedAt <= '2013-07-05 23:59:00.000'
 GRoup By c.Name,  w.Description,  cat.Description
 HAVING COUNT(wc.WidgetImpressionID) > 0
 order by  c.Name, w.Description, cat.Description

SQL GROUP BY计算行数而不是金额总和

1 个答案: