Question

我有内连接两个表并显示。我尝试了下面给出的代码。但它会产生错误＆＃34; Ambiguous Column site_name＆＃39; ＆＃34;

SELECT site_name, Mains_Run_Hrs, DG_Run_Auto_Mode, Battery_Run_Hrs,Solar_Run_hrs 
FROM tbl_runtime_report INNER JOIN tbl_site_details 
ON tbl_runtime_report.Site_ID=tbl_site_details.site_id 
WHEREsite_name=@site_name

Answer 1

如果两个表中都有site_name，则需要指定要查询的版本，即

WHERE tbl_runtime_report.site_name = @site_name

或者，您可以使用别名

SELECT rt.site_name, ... 
FROM tbl_runtime_report rt ...
WHERE rt.site_name = @site_name

Answer 2

SELECT  Report.ColumnName,Details.ColumnName
FROM tbl_runtime_report Report
     INNER JOIN tbl_site_details  Details ON Report.Site_ID=Details .site_id 
WHERE Report.site_name=@site_name -- use the relevant alias here

请参阅When to use SQL Table Alias

不明确的列'Site_name'

2 个答案: