Google Big Query中的每日點擊次數

Question

我使用Google Big Query來查找每天點擊次數。這裏是我的查詢，

SELECT COUNT(*) AS Key, 
     DATE(EventDateUtc) AS Value 
FROM [myDataSet.myTable] 
WHERE ..... 
GROUP BY Value 
ORDER BY Value DESC 
LIMIT 1000; 

這是工作正常，但它忽略了與0人次日期。我想包括這個。我無法在Google Big Query中創建臨時表。如何解決這個問題。

測試得到錯誤Field 'day' not found.

SELECT COUNT(*) AS Key, 
     DATE(t.day) AS Value from (
     select date(date_add(day, i, "DAY")) day 
from (select '2015-05-01 00:00' day) a 
cross join 
(select 
    position(
    split(
     rpad('', datediff(CURRENT_TIMESTAMP(),'2015-05-01 00:00')*2, 'a,'))) i 
from (select NULL)) b 

     ) d 
left join [sample_data.requests] t on d.day = t.day 
GROUP BY Value 
ORDER BY Value DESC 
LIMIT 1000; 

Answer 1

您可以查詢存在於你的表中的數據，查詢不能猜出哪個日期從表中失蹤。您需要用編程語言處理這個問題，或者您可以使用join with a numbers table and generates the dates on the fly。

如果你知道你在查詢中具有的日期範圍，您可以生成天：

select date(date_add(day, i, "DAY")) day 
from (select '2015-01-01' day) a 
cross join 
(select 
    position(
    split(
     rpad('', datediff('2015-01-15','2015-01-01')*2, 'a,'))) i 
from (select NULL)) b; 

然後你就可以加入這個結果與您的查詢表：

SELECT COUNT(*) AS Key, 
     DATE(t.day) AS Value from (...the.above.query.pasted.here...) d 
left join [myDataSet.myTable] t on d.day = t.day 
WHERE ..... 
GROUP BY Value 
ORDER BY Value DESC 
LIMIT 1000;