如何添加标记每个值之一的列？

Question

我要加入 SQL 中的两个表。我目前有 SQL 作为：

SELECT table1.ProjectName AS "Project Name",
  table1.ProjectCost AS "Project Cost",
  table2.ExpenseName AS "Expense Name",
  table2.ExpenseCost AS "Expense Cost"
  FROM TABLE1 table1
  INNER JOIN TABLE2 table2
  ON table1.ProjectName = table2.ProjectName;

结果如下：

Project Name    | Project Cost  | Expense Name  | Expense Cost
------------------------------------------------------------
Project 1   | 123456        | Labor     | 12365  
Project 1   | 123456        | Rent      | 120000  
Project 2   | 8421              | (null)    | (null)  
Project 3   | 987654        | Paper     | 1023  
Project 3   | 987654        | Pens      | 546

我想添加一行来标记每个项目名称之一，以便我可以在 Tableau 中对其进行筛选并计算项目成本的总和。

例如：

Project Name    | Project Cost  | Expense Name  | Expense Cost  | Unique Value
----------------------------------------------------------------------------
Project 1   | 123456        | Labor     | 12365     | Y  
Project 1   | 123456        | Rent      | 12000     | N  
Project 2   | 8421      | (null)    | (null)        | Y  
Project 3   | 987654        | Paper     | 1023      | Y  
Project 3   | 987654        | Pens      | 546       | N  
Project 3   | 987654        | Party     | 9856      | N

Answer 1

我想你可以使用滞后功能，其实我很久以前就问过这个问题，我可以分享我的问题，也许对你有帮助。但是，您可以创建 table 时间 table 并根据滞后函数填充该列，而不是选择值：

Answer 2

您也可以使用排名：

select t.* 
     , case when lag(project_name) over (partition by 1 order by project_name, rownum) = project_name then 'N' else 'Y' end n
     , case when rank() over (partition by project_name order by rownum) >  1 then 'N' else 'Y' end n
from join_result

如何添加标记每个值之一的列？

How do I add a column that marks one of each value?

sql

oracle-sqldeveloper

tableau-api