C# 根据条件放弃SQL结果行

我有以下数据：

Ord_Act_Deliv_DateTime  TrmnlGrp_Key    Ord_CustLoc_Key Ord_Driver_Key     Ord_Inv_No    Credits
2016-04-01 11:00:00     3               429             93                 INV-00055295  True
2016-04-01 11:00:00     3               135             93                 INV-00055295A False
2016-04-01 11:00:00     3               429             93                 INV-00055295C False

我想做的事情如下

if credits = true
set @temp_invoice_no = Ord_inv_No + 'C'

SELECT * FROM Orders WHERE Ord_Inv_No NOT IN (original inv no with credit, inv no + 'C')

在我选择的日期范围内，我可能有许多类似的记录，我需要确保原始记录和信用记录不会进入最终结果集。从我到目前为止的研究来看，这似乎是大多数简单比较的建议，我认为这不适合这种情况，或者如果使用在语句中传递或声明的变量指定单独的select语句。也许我误解了CASE和IF的功能。请帮帮我，我卡住了

---

我也可以在C语言中进行探索，但我在C语言中还是相当生疏的。我在一个DataTable中得到了结果，但除了将每一行转换为一个字符串之外，我还不知道如何计算该表

因此，您有一组记录，其中要关注的列是Ord_Inv_No和Credits

第一点，您正在设置一个临时变量，您似乎什么都不做

至于select查询

 SELECT * FROM Orders WHERE Ord_Inv_No NOT IN (original inv no with credit, inv no + 'C')

我在带有信用的原始inv no，inv no+‘C’中看到的唯一区别是，它的信用列值从第一位设置为True。如果是这种情况，此查询应适用于您：

SELECT * FROM Orders WHERE Credits=true

---

因此，您有一组记录，其中要关注的列是Ord_Inv_No和Credits

第一点，您正在设置一个临时变量，您似乎什么都不做

至于select查询

 SELECT * FROM Orders WHERE Ord_Inv_No NOT IN (original inv no with credit, inv no + 'C')

我在带有信用的原始inv no，inv no+‘C’中看到的唯一区别是，它的信用列值从第一位设置为True。如果是这种情况，此查询应适用于您：

SELECT * FROM Orders WHERE Credits=true

---

我最终在C中完成了以下工作：

 foreach(DataRow row in results.Rows)
        {
            credit = Convert.ToBoolean(row["Credits"].ToString());
            if(credit)
            {
                if (String.IsNullOrWhiteSpace(selectString))
                {
                    tempString = row["Ord_Inv_No"].ToString();
                    selectString = String.Format("'{0}', '{0}C'",tempString);
                }
                else
                {
                    tempString = row["Ord_Inv_No"].ToString();
                    selectString += String.Format(", '{0}', '{0}C'", tempString);
                }

            }
        }

        // The following three lines are for troubleshooting, shows the items being selected out and the initial count.
        // If DriverKey is 9 and dates are 5-2-16 - 5-8-16 String should show to INV numbers and count should be 19
        if (!String.IsNullOrWhiteSpace(selectString))
            MessageBox.Show(selectString);
        MessageBox.Show(results.Rows.Count.ToString());
        // only process if string is not empty, need code

        if (!String.IsNullOrWhiteSpace(selectString))
        {
            try
            {
                var rows = results.Select("Ord_Inv_No IN (" + selectString + ")");
                foreach (var row in rows)
                    row.Delete();
                results.AcceptChanges();
                // This is for troubleshooting, gets the final number of rows after edits 
                // If DriverKey is 9 and dates are 5-2-16 - 5-8-16 final count should be 17
                MessageBox.Show(results.Rows.Count.ToString());
                results.Columns.Remove("Credits");
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }

---

我最终在C中完成了以下工作：

 foreach(DataRow row in results.Rows)
        {
            credit = Convert.ToBoolean(row["Credits"].ToString());
            if(credit)
            {
                if (String.IsNullOrWhiteSpace(selectString))
                {
                    tempString = row["Ord_Inv_No"].ToString();
                    selectString = String.Format("'{0}', '{0}C'",tempString);
                }
                else
                {
                    tempString = row["Ord_Inv_No"].ToString();
                    selectString += String.Format(", '{0}', '{0}C'", tempString);
                }

            }
        }

        // The following three lines are for troubleshooting, shows the items being selected out and the initial count.
        // If DriverKey is 9 and dates are 5-2-16 - 5-8-16 String should show to INV numbers and count should be 19
        if (!String.IsNullOrWhiteSpace(selectString))
            MessageBox.Show(selectString);
        MessageBox.Show(results.Rows.Count.ToString());
        // only process if string is not empty, need code

        if (!String.IsNullOrWhiteSpace(selectString))
        {
            try
            {
                var rows = results.Select("Ord_Inv_No IN (" + selectString + ")");
                foreach (var row in rows)
                    row.Delete();
                results.AcceptChanges();
                // This is for troubleshooting, gets the final number of rows after edits 
                // If DriverKey is 9 and dates are 5-2-16 - 5-8-16 final count should be 17
                MessageBox.Show(results.Rows.Count.ToString());
                results.Columns.Remove("Credits");
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }