Question

当我尝试查看“报告此错误”消息时，

---------------------------
Crystal Report Viewer
---------------------------
Failed to open a rowset.
Details: ADO Error Code: 0x
Source: Microsoft OLE DB Provider for SQL Server
Description: Warning: Null value is eliminated by an aggregate or other SET operation.
SQL State: 01003
Native Error: 
---------------------------
OK   
---------------------------

注意：我将Direct连接到已排序的程序。

Answer 1

检查内部程序如何使用聚合函数。

您可以使用

关闭此讯息

SET ANSI_WARNINGS ON;

但我不建议这样做。

示例如何获得警告“聚合或其他SET操作消除了空值”

  CREATE TABLE T1 (
     a INT, 
     b INT NULL, 
     c VARCHAR(20)
  );
  GO

  SET NOCOUNT ON

  INSERT INTO T1 
  VALUES (1, NULL, '');
  INSERT INTO T1 
  VALUES (1, 0, '');
  INSERT INTO T1 
  VALUES (2, 1, '');
  INSERT INTO T1 
  VALUES (2, 2, '');

  SET NOCOUNT OFF;
  GO

  PRINT '**** Setting ANSI_WARNINGS ON';
  GO

  SET ANSI_WARNINGS ON;
  GO

  PRINT 'Testing NULL in aggregate';
  GO
  SELECT a, SUM(b) 
  FROM T1 
  GROUP BY a;
  GO

Crystal Report中的问题

1 个答案: