Question

我是ASP新手。我需要帮助来创建报告。我有一个SQL查询

SELECT StudentID, StudentName, SectionID, ExamID, SubjectID, Subject, Marks, TotalMarks
, Percentage, Grade, (SELECT MAX(Marks) AS Exp1 
FROM tbl_Result 
WHERE (SectionID = @SectionID) 
  AND (SubjectID = view_StudentResult.SubjectID)) AS SubjectToper 
  FROM view_StudentResult WHERE (StudentID = @StudentID)

当我在报告中显示时，所有其他字段都会根据需要填充，但SubjectToper字段显示为空白。有人可以帮助你以优雅的方式做到这一点吗？

Answer 1

~~尝试使用Exp1填充该字段。~~

~~您正在为整个子查询提供别名SubjectToper，但实际选择的是别名Exp1。~~

结帐this explanation of sub queries。特别是最后一个将子查询分配给值的示例。也许这会奏效？

您的SQL看起来像：

SELECT StudentID, StudentName, SectionID, ExamID, SubjectID, Subject, Marks, TotalMarks, Percentage, Grade, 
    SubjectToper = (SELECT MAX(Marks) FROM tbl_Result 
    WHERE (SectionID = @SectionID) AND (SubjectID = view_StudentResult.SubjectID)) 
FROM view_StudentResult WHERE (StudentID = @StudentID)

注意我删除了别名并将子查询分配给了SubjectToper。

我希望这有效，否则我害怕我没有想法。

带有子查询数据集的RDLC报告

1 个答案: