ASP：子查询返回超过 1 个值

Question

我有一个本地托管的网站，带有一个 MS SQL Server 数据库。我正在尝试从数据库中填充记录列表，但查询返回错误。

asp网页上的代码：

dim sRegID

sRegID = Request.QueryString("RegistrantID")
sSQL = "select CourseID, CourseSectionID, RegistrationID, RegistrantCourseID,AmountDeferred,PaymentType,  DateSubmitted, (select TransactionID  from qryRegistrantCoursePayment where RegistrantCourseID = qryRegistrantCoursedetail.RegistrantCourseID) as TransactionID, (select PaymentID  from qryRegistrantCoursePayment where RegistrantCourseID = qryRegistrantCoursedetail.RegistrantCourseID) as PaymentID from qryRegistrantCourseDetail where RegistrationStatus in ('D') and RegistrantID = " & sRegID & " and AmountDeferred > 0  order by DateSubmitted"
Set rs = objconn.execute(sSQL)

错误信息：

Microsoft OLE DB Provider for SQL Server 错误“80004005”

子查询返回超过 1 个值。这是不允许的，当 子查询遵循 =、!=、、>= 或当子查询用作 一个表达式。

有人可以帮我解决这个问题吗？我在查询写作方面不是很有经验。提前致谢。 :)

---

好的，查询已通过连接修复...但现在 asp 正在运行。

Else
Response.Write "<table border=1 cellpadding=3 cellspacing=0>"
Response.write "<tr>"
Response.Write "<td>" & "<a href=""javascript:pick('','','','','','','','','')"">" & "None Selected" & "</a></td>"
Response.write "</tr>"
Do Until rs.eof

 Response.Write "<tr>"
 'Response.Write "<td>" & "<a href=""javascript:pick('" & trim(rs("BLDG_CD")) & "')'>" & trim(rs("AC_Title")) & "</a></td>"
 Response.Write "<td>" & "<a href=""javascript:pick(" & quote(trim(rs("q.RegistrationID"))) & "," & quote(trim(rs("q.RegistrantCourseID"))) & "," & quote(trim(rs("q.CourseID"))) & "," & quote(trim(rs("q.CourseSectionID"))) & "," & quote(trim(rs("x.PaymentID"))) & "," & quote(trim(rs("q.AmountDeferred"))) & "," & quote(trim(rs("q.PaymentType"))) & "," & quote(formatdatetime(trim(  rs("q.DateSubmitted") ),2)) & ",'" &  trim("" & rs("x.TransactionID")) & "')"">" & formatcurrency(0 & rs("q.AmountDeferred"))& "</a></td>"
 Response.Write "</tr>"

错误信息：

ADODB.Recordset 错误 '800a0cc1'

在与请求对应的集合中找不到项目 名称或序号。

我无法理解为什么错误是 ADODB 而我使用过

Set rs =objconn.execute(sSQL)

再次感谢您提供的任何帮助。

Answer 1

根据错误消息，(select TransactionID ... 或 (select PaymentID ... 两个子查询返回不止一行（例如，您的数据模型允许每位注册者在每门课程中多次付款？）。

虽然您可以通过引入带有TOP 1 的子查询来解决此问题，但最好确定数据为何不符合您的预期：

另外，由于两个子查询使用相同的谓词作用于同一张表，因此您可以将子查询更改为派生表并加入到该表中：

select
  CourseID, 
  CourseSectionID, 
  RegistrationID, 
  RegistrantCourseID,
  AmountDeferred,
  PaymentType,  
  DateSubmitted, 
  x.TransactionID,
  x.PaymentID
from qryRegistrantCourseDetail 
    cross apply
    (select TOP 1 TransactionID, PaymentID
     from qryRegistrantCoursePayment
     where RegistrantCourseID = qryRegistrantCoursedetail.RegistrantCourseID
     ) AS x
where ...
order by DateSubmitted

如果您解决了子查询返回多行的原因，则可以更改为简单连接：

inner join qryRegistrantCoursePayment as x
    on x.RegistrantCourseID = qryRegistrantCoursedetail.RegistrantCourseID

SqlFiddle of both queries here