小编top*_*pry的帖子

数据是本地CSV文件,通过OleDB加载到ado.net数据集中.该表有40多个列,包括发票详细信息.每行是发票中的单独行项目,可以包含1到n行.

该查询用于将发票明细分组为每个发票的单行,总计发票金额和到期余额.

以下工作,我正在尝试确定:是否可以在单个查询中执行此操作？

    //group the invoices by invoicenumber and sum the total
//Zoho has a separate record (row) for each item in the invoice
//first select the columns we need into an anon array   
var invoiceSum =
    DSZoho.Tables["Invoices"].AsEnumerable()
    .Select (x => 
        new {  
            InvNumber = x["invoice number"],
            InvTotal = x["item price"],
            Contact = x["customer name"],
            InvDate = x["invoice date"],
            DueDate = x["due date"],
            Balance = x["balance"],
            } );
    //then group and sum
    var invoiceTotals =
        invoiceSum
        .GroupBy (s => new …