Question

我有一张这样的表：

REFERENCE     FILE             FILESIZE    HEADING
--------------------------------------------------
ref001        abc123.zip       0            
ref001        def123.sgm       46661       pdf
ref001        ghi123.xml       1159        xml
ref001        jkl456.zip       0         
ref001        mno456.sgm       22852       rtf
ref001        pqr456.xml       1181        xml
ref001        stu789.zip       0
ref001        vwx789.sgm       5959        pdf
ref001        yza789.xml       1162        xml

如何根据上面的FILESIZE AND HEADING COLUMN创建新列？像这样：

FILE             PDF         RTF        XML
--------------------------------------------
abc123.zip       0           0          0 
def123.sgm       46661       0          0
ghi123.xml       0           0          1159  
jkl456.zip       0           0          0
mno456.sgm       0           22852      0
pqr456.xml       0           0          1181
stu789.zip       0           0          0
vwx789.sgm       5959        0          0
yza789.xml       0           0          1162

感谢您的帮助！ ☺

Answer 1

您可以使用PIVOT：

SELECT [File],
       COALESCE([PDF],0) AS [PDF],
       COALESCE([XML],0) AS [XML],
       COALESCE([RTF],0) AS [RTF]
FROM #tab
PIVOT
(
  MAX(FILESIZE) FOR HEADING IN ([PDF],[XML],[RTF])
) AS pvt

的 LiveDemo

或简单CASE：

SELECT [File], [XML] = CASE WHEN Heading = 'xml' THEN FileSize ELSE 0 END, [PDF] = CASE WHEN Heading = 'pdf' THEN FileSize ELSE 0 END, [RTF] = CASE WHEN Heading = 'rtf' THEN FileSize ELSE 0 END FROM #tab

的 LiveDemo2

添加新列并从现有表中分配值

1 个答案: