悖论数据库 SQL 多重联接

Question

我正在处理一个遗留的 VB6 项目，我需要像这样进行 JOIN 调用：

SELECT C.Cnum, C.RealDate, M.Name, R.Price, R.Qnt, R.RealPrice, R.QntP, R.QntR, M.Name
FROM "CHECK" C 
LEFT JOIN "RCHECK" R ON C.Cnum = R.Cnum 
LEFT JOIN "PCHECK" P ON C.Cnum = P.Cnum 
LEFT JOIN "MONEY" M ON P.Curency = M.Sifr 
LEFT JOIN "MENU" MN ON R.Sifr = MN.Sifr 
WHERE C.Cnum > 0 ORDER BY C.Cnum

我使用 "Driver={Microsoft Paradox Driver (*.db )};DriverID=538" 作为连接字符串的一部分，但它似乎不支持多个连接！这很奇怪。

任何想法如何解决/解决方法？

是的，当我在Borland数据库桌面中运行此查询时，它工作正常。

更新 1：

我的VB代码：

Dim Conn As New ADODB.Connection
Dim sConnStr As String
Dim sQuery As String
sConnStr = "Driver={Microsoft Paradox Driver (*.db )};DriverID=538;Fil=Paradox 5.X;CollatingSequence=ASCII;DBQ=C:DBTOFTPBUFF;DefaultDir=C:DBTOFTPBUFF;PWD=SOMEPASS;"
sQuery = "SELECT C.Cnum, C.RealDate, M.Name, R.Price, R.Qnt, R.RealPrice, R.QntP, R.QntR, M.Name " & _
    "FROM ""CHECK"" C " & _
    "LEFT JOIN ""RCHECK"" R ON C.Cnum = R.Cnum " & _
    "LEFT JOIN ""PCHECK"" P ON C.Cnum = P.Cnum " & _
    "LEFT JOIN ""MONEY"" M ON P.Curency = M.Sifr " & _
    "LEFT JOIN ""MENU"" MN ON R.Sifr = MN.Sifr " & _
    "WHERE C.Cnum > 0 " & _
    "ORDER BY C.Cnum"
Conn.ConnectionString = sConnStr
Conn.Open

Answer 1

一些旧的驱动程序通常要求多个 JOIN 必须括在括号中。

尝试这样的事情：

FROM 
    (
        "CHECK" C
        INNER JOIN 
        "RCHECK" R
            ON C.Cnum = R.Cnum 
    )
    INNER JOIN 
    "PCHECK" P
        ON P.Cnum = C.Cnum