查詢以獲得展示次數和相關點擊次數

Question

我似乎無法得到此查詢以給我正確的結果。

select 
    datepart(day, i.timestamp) as [day], 
    i.campaignID, i.creativeID 
    , count(distinct i.sessionID) as [Impressions] 
    , count(case when e.eventID in (1,2,3) then 1 else 0 end) as Clicks 

from impressions i 
left join Events e 
    on i.sessionID = e.sessionID 

group by 
    datepart(day, i.timestamp) 
    , i.campaignID, i.creative 

order by [day] 

我也嘗試在then子句中用e.eventid替換1。我在結果中獲得太多點擊。事件每個sessionid有多個記錄，因爲許多類型的事件可能發生在同一個會話中（滾動，展開等），我希望計算的事件將有一個1,2或3的偶數，因爲這些將是3可能的鏈接，你可以點擊。我在尋找的是通過計算展示次數和相關點擊來計算點擊率，如果沒有點擊，我希望它反映爲0，而不是從結果中丟失，這就是即時獲得的結果。

任何幫助表示感謝，提前感謝您寶貴的時間！

Answer 1

嘗試用sum替換第二count，就像這樣：

select 
    datepart(day, i.timestamp) as [day], 
    i.campaignID, i.creativeID 
    , count(distinct i.sessionID) as [Impressions] 
    , sum(case when e.eventID in (1,2,3) then 1 else 0 end) as Clicks 

from impressions i 
left join Events e 
    on i.sessionID = e.sessionID 

group by 
    datepart(day, i.timestamp) 
    , i.campaignID, i.creative 

order by [day] 

或者，你可以繼續count和移動eventID過濾到where條款：

select 
    datepart(day, i.timestamp) as [day], 
    i.campaignID, i.creativeID 
    , count(distinct i.sessionID) as [Impressions] 
    , count(e.eventID) as Clicks 

from impressions i 
left join Events e 
    on i.sessionID = e.sessionID 

where e.eventID in (1,2,3) 

group by 
    datepart(day, i.timestamp) 
    , i.campaignID, i.creative 

order by [day] 

但我懷疑您的on條款中將需要額外的過濾條件。但是，我不確定你的桌子的結構。