需要帮助将第二个参数添加到组合列表。

Question

我想添加第二个参数，如果第一个参数失败/相同的日期。我想要位置是第二个参数，这个例子是“位置a”。因此，在这种情况下：

name    date  doc   info   location 
===================================================================== 
janedoe   7/21  jones  47     a 
jonwall   7/1  nick   21     a 

name   date  doc   info   location 
================================================================= 
janedoe   7/21  jones  74     b 
jonwall   8/31  hall   22     b 

这样

name    date   doc   info   location 
========================================================================= 
janedoe   7/21   jones   47     a 
jonwall   8/31   hall   22     b 

Need help combining columns from 2 tables and keep remaining data in rows based on parameters in sql

Answer 1

你需要编辑的问题的结局应该会出现。通过指向原始问题的指针很难回溯并提供对您问题的答案。你应该提供一个完整的问题。但是，我会采取刺。使用作为您之前答案的答案的查询，您需要将location desc或location asc添加到窗口函数的分区，以在两个日期匹配时充当决胜者。

另外，请查看MERGE命令。它为类似的问题提供了一种更清洁的方法。

DECLARE @A TABLE(name NVARCHAR(20),date DATETIME,doc NVARCHAR(20),info NVARCHAR(20),location NVARCHAR(20)) 
DECLARE @B TABLE(name NVARCHAR(20),date DATETIME,doc NVARCHAR(20),info NVARCHAR(20),location NVARCHAR(20)) 

INSERT INTO @A SELECT 'janedoe','7/21/2017','jones','47','a' 
INSERT INTO @A SELECT 'jonwall','7/1/2017','nick','21','a' 
INSERT INTO @B SELECT 'janedoe','7/21/2017','jones','74','b' 
INSERT INTO @B SELECT 'jonwall','8/31/2017','hall','22','b' 

INSERT INTO @B SELECT 'janedoe','7/21/2017','jones','74','a' 
INSERT INTO @B SELECT 'jonwall','8/31/2017','hall','22','c' 

    ;WITH allRows AS (
     SELECT * FROM @A 
     UNION ALL 
     SELECT * FROM @B 
    ), mostRecent AS (
     SELECT *, 
       ROW_NUMBER() OVER 
        (PARTITION BY name ORDER BY date DESC, location desc) as rn 
     FROM allRows 
    ) 
    SELECT * 
    FROM mostRecent 
    WHERE rn = 1