組/骨料上在SQL

Question

DB是SQL Server 2008的

表A的列的不同值：

值在 '標識符' 柱：A，B，C，d，E，F 值在 '餘額' 柱：10，100，30，50，70，55

所需的結果集：

值在 'Identifier_New' 柱：Z，Y，X 值在總和（餘額）柱： 40，170，105

邏輯地圖總結結餘：標識符A和C作爲Z的

總和和組餘額 標識符B和E爲Y的總和與組餘額 標識符d和E爲X的總和和組餘額。

我可以在單個sql中獲得上述所需的結果集嗎？

感謝

Answer 1

試試這個：

SELECT x.v AS Identifier_New, SUM(Balances) 
FROM mytable 
CROSS APPLY (SELECT CASE Identifier 
         WHEN 'A' THEN 'Z' 
         WHEN 'C' THEN 'Z' 
         WHEN 'B' THEN 'Y' 
         WHEN 'E' THEN 'Y' 
         WHEN 'D' THEN 'X' 
         WHEN 'F' THEN 'X' 
        END) AS x(v) 
GROUP BY x.v 

Demo here

Answer 2

SELECT CASE WHEN Identifier = 'A' or Identifier = 'C' THEN 'Z' 
    WHEN Identifier = 'B' or Identifier = 'E' THEN 'Y' 
    WHEN Identifier = 'D' or Identifier = 'F' THEN 'X' 
    END AS [Identifier_New], 
    SUM(Balances) AS [Sum of Balances] 
FROM TABLE A 
GROUP BY CASE WHEN Identifier = 'A' or Identifier = 'C' THEN 'Z' 
    WHEN Identifier = 'B' or Identifier = 'E' THEN 'Y' 
    WHEN Identifier = 'D' or Identifier = 'F' THEN 'X' 
    END