asp.net中的查詢字符串錯誤

Question

我在查詢中遇到問題。

錯誤是：{「無效的列名稱總記錄「」}

我有一個名爲upload_news表在此表中存在多條記錄，我想取回按國家數據明智的，其中在不同的國家大於20記錄。

select count(Distinct country) AS TotalRecords, country from upload_news where TotalRecords > 20"; 

Answer 1

您需要使用group by和having：

select count(Distinct country) AS TotalRecords, country from upload_news 
group by country 
having count(Distinct country) > 20 

Answer 2

嘗試這樣

"SELECT * 
FROM 
(
select count(Distinct country) AS TotalRecords, country from upload_news 
group by country 
) T 
where TotalRecords > 20"; 

因爲總記錄別名列，你不能直接訪問它。