Question

我正在尝试按错误类型进行分组，但不断收到此错误。列'fid_crm_sp_recon.URL'在选择列表中无效，因为它不包含在聚合函数或GROUP BY子句中。

SELECT URL, Name, statusCode, ErrorType
FROM fid_crm_sp_recon
GROUP BY ErrorType

Answer 1

正如评论中所述，您只是没有正确设置group by。以下是让您走上正确道路的几种可能性：

-- Group by all columns
SELECT URL, Name, statusCode, ErrorType
FROM fid_crm_sp_recon
GROUP BY URL, Name, statusCode, ErrorType;

-- Run aggregates on the non-grouped columns
SELECT MIN(URL) AS MinURL
    , MAX(Name) AS MaxName
    , AVG(statusCode) AS AvgStatusCode -- Assuming a number here, just an example
    , ErrorType
    , COUNT(*) AS Num
FROM fid_crm_sp_recon
GROUP BY ErrorType;

Answer 2

group by应始终与select子句后的聚合函数一起使用，或者将group by应用于所有选定的列

 SELECT URL, Name, statusCode, ErrorType  FROM fid_crm_sp_recon  GROUP BY URL, Name, statusCode, ErrorType

您可以浏览这些链接

http://www.techonthenet.com/sql/group_by.php http://www.w3schools.com/sql/sql_groupby.asp

未使用的组未包含在聚合函数或group by子句中

2 个答案: