从 3 个 CSV 文件中排序和选择

Posted 2023-03-23

【中文标题】从 3 个 CSV 文件中排序和选择

【英文标题】：Sorting and selecting from 3 CSV files

【发布时间】：2019-08-14 23:27:25

【问题描述】：

每个月我都会收到几个 CSV 文件的数据转储。一些文件超过了 Microsoft Excel 的最大行数，但我能够使用 ADODB 记录集和连接来选择和排序文件，并且只加载我需要的值。我可以让它为两个文件工作，但在一种情况下，我需要它去三个文件，这就出现了问题。

以下代码适用于两个文件：

Dim cnD As New ADODB.Connection
cnD.Provider = "Microsoft.ACE.OLEDB.12.0"
cnD.ConnectionString = "Data Source=" + fullFolder + ";Extended Properties=""text;HDR=Yes;" + _
        "FMT=Delimited(,)"""
cnD.Open
Dim rsD As New ADODB.Recordset
rsD.ActiveConnection = cnD
rsD.Source = "SELECT Data.id AS HapDataId, Data.createtimestamp, " + _
                    "Data.lastmodified, Goals.* " + _
        "FROM HAPData.csv AS Data " + _
            "INNER JOIN HAPGoals.csv AS Goals ON Data.Id = Goals.hapid " + _
        "WHERE Format(Data.createtimestamp, " + """" + "yyyy-MM-dd" + """" + ") >= " + _
                    "Format(#" + startDateStr + "#, " + """" + "yyyy-MM-dd" + """" + ") OR " + _
                "Format(Data.lastmodified, " + """" + "yyyy-MM-dd" + """" + ") >= " + _
                    "Format(#" + startDateStr + "#, " + """" + "yyyy-MM-dd" + """" + ") " + _
        "ORDER BY Data.id, Data.lastmodified, Data.createtimestamp, Goals.id "
rsD.Open

并生成以下 SQL：

SELECT Data.id AS HapDataId, Data.createtimestamp, Data.lastmodified, Goals.* 
FROM HAPData.csv AS Data INNER JOIN HAPGoals.csv AS Goals ON Data.id = Goals.hapid 
WHERE Format(Data.createtimestamp, "yyyy-MM-dd") >= Format(#7/1/2019#, "yyyy-MM-dd") OR 
    Format(Data.lastmodified, "yyyy-MM-dd") >= Format(#7/1/2019#, "yyyy-MM-dd") 
ORDER BY Data.id, Data.lastmodified, Data.createtimestamp, Goals.id 

如果我修改它以添加第三个文件，我会得到以下 SQL：

SELECT Data.id AS HapDataId, Data.createtimestamp, Data.lastmodified, Goals.*, Actions.* 
FROM HAPData.csv AS Data INNER JOIN HAPGoals.csv AS Goals ON Data.id = Goals.hapid 
    INNER JOIN HAPActionSteps.csv AS Actions ON Goals.id = Actions.goalid 
WHERE Format(Data.createtimestamp, "yyyy-MM-dd") >= Format(#7/1/2019#, "yyyy-MM-dd") OR 
    Format(Data.lastmodified, "yyyy-MM-dd") >= Format(#7/1/2019#, "yyyy-MM-dd") 
ORDER BY Data.id, Data.lastmodified, Data.createtimestamp, Goals.id, Actions.id

在 rsD.Open 行上产生以下错误：

查询表达式“Data.id =Goals.hapid INNER JOIN HAPActionSteps.csv AS Actions ON Goals.id = Actions.goali”中的语法错误（缺少运算符），错误代码为 -2147217900

谁能看到我的 SQL 出了什么问题？

【参考方案1】：

我相信如果这是一个类似 Access 的语法，你需要这样的括号：

FROM (HAPData.csv AS Data INNER JOIN HAPGoals.csv ON Data.id = Goals.hapid)
           INNER JOIN HapActionSteps.csv AS Actions ON Goals.id = Actions.goalid

【讨论】：

是的，就是这样。非常感谢！