將同一表中的列按GROUP BY划分為兩個別名列

Question

我有這張桌子： 桌子

而且我想知道是否有一些SQL查詢返回以下內容： 結果

我試過了但是沒用：

SELECT Object, 
       SUM(CASE WHEN Key = 'A' THEN Qty END) As Key A, 
       SUM(CASE WHEN Key = 'B' THEN Qty END) As Key B
FROM tab

甚至添加了GROUP BY子句，但錯誤在CASE子句中

Answer 1

我期望這樣的事情：

SELECT Object,
       SUM(CASE WHEN Key = 'A' THEN Qty END) As KeyA,
       SUM(CASE WHEN Key = 'B' THEN Qty END) As KeyB
FROM table  -- table won't work as a table name
GROUP BY object;

我添加了GROUP BY並修復了列別名。

Answer 2

執行匯總時在查詢中添加分組依據

    SELECT Object, 
   SUM(CASE WHEN Key = 'A' THEN Qty END) As Key_A,
   SUM(CASE WHEN Key = 'B' THEN Qty END) As Key_B
    FROM table group by Object

您已經使用了列別名名稱的空間，但我將其更改了