ASP：子查詢返回的值超過1

Question

我有一個本地託管的網站，帶有MS SQL Server數據庫。我試圖填充數據庫中的記錄列表，但查詢返回錯誤。

代碼的ASP網頁：

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) 

錯誤消息：

的Microsoft OLE DB提供程序SQL Server錯誤 '80004005'

子查詢返回多個值。當 子查詢遵循=，！=，<，< =，>，> =或當子查詢用作 表達式時，這是不允許的。

有人可以幫我解決這個問題嗎？我在查詢寫作方面不是很有經驗。提前致謝。 :)

---

好吧，查詢是用連接修復的......但是現在asp已經出現了。

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>" 

錯誤消息：

ADODB.Recordset錯誤 '800a0cc1'

產品無法對應於請求 名稱或序號的集合中找到。

我無法理解爲什麼錯誤是ADODB，而我又用

Set rs =objconn.execute(sSQL) 

感謝任何可能的幫助。

Answer 1

根據錯誤消息，兩個子查詢(select TransactionID ...或(select PaymentID ...返回多行（例如，您的數據模型允許每個註冊人每個課程支付多個付款？）。

雖然可以解決此通過與TOP 1引入子查詢，這將是有益的，以確定爲什麼數據不表現爲你的期待：

而且，因爲兩個子查詢在同一個錶行事用相同的謂詞，您可以更改子查詢到一個派生表，並加入到，而不是：

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 

如果解決了，爲什麼子查詢返回多行，那麼你可以改變一個簡單連接：

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

SqlFiddle of both queries here