SELECT查詢（）

Question

在此查詢有一個錯誤：

"Column 'upload_news.upload_time' is invalid in the HAVING clause because it is not contained in either an aggregate function or the GROUP BY clause." 

我想顯示的被兩個日期之間的關係不同的國家與國家名稱的記錄數;

select count(Distinct news_id) AS TotalRecords, country 
from upload_news 
group by country 
having [upload_time] between GetDate()-2 AND GetDate() 

Answer 1

的HAVING子句將運行所有的數據進行分組之後，因此只能對分組聚合過濾數據。

如果您想篩選出列中的數據進行分組之前，您需要使用WHERE條款：

select count(Distinct news_id) AS TotalRecords, country 
from upload_news 
where [upload_time] between GetDate()-2 AND GetDate() 
group by country 

注意，WHERE條款需要去前的GROUP BY條款。

Answer 2

這個查詢：

select count(Distinct news_id) AS TotalRecords, country 
from upload_news 
group by country 
having [upload_time] between GetDate()-2 AND GetDate() 

應該是：

select count(Distinct news_id) AS TotalRecords, country 
from upload_news 
where upload_time between (NOW()- INTERVAL 2 DAY) AND NOW() 
group by country