如果存在重复行，如何在sql中显示空白记录

Question

我的SQL查询结果，

EmployeeID    EmployeeName    Department
1             John            Sales
2             Robert          Sales
3             Sudhir          Sales
4             Roj             Development

输出应该是

EmployeeID    EmployeeName    Department
1             John            Sales
2             Robert          
3             Sudhir          
4             Roj             Development

Answer 1

你可以这样做：

;WITH CTE
AS
( 
   SELECT EmployeeID, EmployeeName, Department,
     ROW_NUMBER() OVER(PARTITION BY Department ORDER BY(SELECT 1)) rownum
  FROM table1
)
SELECT
  EmployeeId,
  EmployeeName,
  CASE rownum
    WHEN 1 THEN Department
    ELSE ''
  END AS Department
FROM CTE
ORDER BY EmployeeID;

SQL Fiddle Demo

请注意：尽量不要在SQL中执行这些格式化操作。 SQL 不是有关格式化的内容。