Oracle 11g 中的 varchar2 中保留的空格字符用于在 SSRS 2008 中显示

Question

是否有空格或其他非打印字符可以插入到 varchar2 列中，这些字符不会被修剪掉并导致 NULL？

我只想在该列中插入一个空白，以便它在 SSRS 2008 报告上不显示任何内容。该列是 PK 的一部分，因此不能为 NULL。当然，使用 '' 不起作用，因为这在 Oracle 中被视为 NULL，并且 ' ' 不起作用，因为它是 varchar2 并被修剪为 NULL。

那么是否有一个我可以插入的文字值，该值在 SSRS 中显示为空，但也可以插入到 Oracle 11g 中的不可空 varchar2 列中？

想了一下，我想像制表符这样的东西可以完成这项工作。但我期待您的建议。

更新

哎呀。猜猜修剪行为来自哪里？我自己的 RTRIM！对此感到抱歉。这么说吧，我因对 Oracle 缺乏经验而被误导，而且我对此感到沮丧，导致我确定错误是在产品中而不是在我的查询中。但是，嘿，这不完全是一个简单的查询。

INSERT INTO WeeklyInvoice (GUID, Mo, VendorName, CostCenter, WkNum, Amt)
SELECT
   ExecID,
   Mo,
   VendorName,
   CostCenter,
   WkNum,
   Amt
FROM (
   WITH CostCenters AS (
      SELECT REGEXP_SUBSTR(CostCenterList, '[^,]+', 1, LEVEL) CostCenter
      FROM DUAL
      CONNECT BY LEVEL <= Length(CostCenterList) - Length(Replace(CostCenterList, ',', '')) + 1
   ), Invoices AS (
      SELECT
         TRUNC(I.Invoice_Dte, 'MM') Mo,
         (TRUNC(I.Invoice_Dte, 'W') - TRUNC(I.Invoice_Dte, 'MM')) / 7 + 1 WkNum,
         I.Vendor,
         V.Vendor_VName,
         RTrim(D.Dis_Acct_Unit) CostCenter,
         D.To_Base_Amt
      FROM
         CostCenters CC
         CROSS JOIN prod.IcCompany C
         INNER JOIN prod.ApDistrib D
            ON C.Company = D.Company
            AND D.Dis_Acct_Unit = CC.CostCenter
         INNER JOIN prod.ApInvoice I
            ON D.Invoice = I.Invoice
            AND D.Vendor = I.Vendor
            AND D.Suffix = I.Suffix
            AND D.Company = I.Company
         INNER JOIN prod.ApVenMast V ON I.Vendor = V.Vendor
      WHERE
         D.Cancel_Seq = 0
         AND I.Cancel_Seq = 0
         AND I.Invoice_Dte >= ADD_MONTHS(FromDate, -2)
         AND I.Invoice_Dte < ToDate
   ), Months AS (
      SELECT ADD_MONTHS(FromDate, LEVEL - 1) Mo
      FROM DUAL
      CONNECT BY LEVEL <= MONTHS_BETWEEN(ToDate, ADD_MONTHS(FromDate, -2))
   ), Names AS (
      SELECT DISTINCT
         I.Mo,
         I.Vendor,
         I.Vendor_VName,
         I.CostCenter
      FROM Invoices I
      UNION ALL
      SELECT M.Mo, '0', 'No Paid Invoices', ' '
      FROM Months M
      WHERE
         NOT EXISTS (
            SELECT I.*
            FROM Invoices I
            WHERE I.Mo = M.Mo
         )
   ), Weeks AS (
      SELECT LEVEL WkNum FROM DUAL CONNECT BY LEVEL <= 5
   )
   SELECT
      N.Mo,
      N.Vendor_VName VendorName,
      N.CostCenter,
      W.WkNum,
      Sum(I.To_Base_Amt) Amt
   FROM
      Names N
      INNER JOIN Weeks W
         ON W.WkNum < 5
         OR EXTRACT (MONTH FROM (N.Mo + 28)) = EXTRACT (MONTH FROM N.Mo)
      LEFT JOIN Invoices I
         ON N.CostCenter = I.CostCenter
         AND N.Vendor = I.Vendor
         AND N.Mo = I.Mo
         AND W.WkNum = I.WkNum
   GROUP BY
      N.Mo,
      N.Vendor_VName,
      N.CostCenter,
      W.WkNum
) X;

Answer 1

在我下面的测试中，单个空格未转换为空：

  SQL> CREATE TABLE t (col VARCHAR2 (10) NOT NULL);

  Table created.

  SQL> INSERT INTO t (col)
    2       VALUES (' ');

  1 row created.

  SQL> SELECT CASE col WHEN ' ' THEN 'I am a single space' ELSE 'I am not a space' END AS col FROM t;

  COL
  -------------------
  I am a single space

  1 row selected.

  SQL> SELECT LENGTH (col) FROM t;
  LENGTH(COL)
  -----------
            1

  1 row selected.

您是否在插入之前修剪值？