asp.net中的查询字符串错误

Question

我的查询有问题。

错误是：{“无效的列名'TotalRecords'。”}

我在这个表中有一个名为upload_news的表有很多记录，我想按国家/地区检索数据，在不同的国家/地区有超过20条记录。

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

试试这个

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

因为 TotalRecords 别名列，您无法直接访问它。