SQL查詢動態表的轉置

Question

sql表如下，

    Name    Salary   NoticePeriod   CTC
    Jack     1520       15          123
    Bruce    1423       35          165 

它包含大約1000行。

我需要對該表進行轉置，以使預期輸出為

    Fields           Jack     Bruce   Mike ..... Sam
    Salary           1520     1423    235   ..   561
    NoticePeriod      15       35      23        253 
    CTC               123      165     45   ...  125

我嘗試在Sql Server 2008中使用Pivot和Unpivot函數。 但是由於Name記錄很大，所以Pivot查詢沒有幫助。

我的SQL嘗試如下

SELECT *
FROM (
  SELECT NAME,
    Salary,
    NoticePeriod,
    CTC
  FROM CTCTABLE WITH (NOLOCK)
  ) AS queryTable
UNPIVOT(Value FOR NAME IN (NAME, Salary, NoticePeriod, CTC)) AS unpv
PIvot(max(Value) FOR NAME IN (Salary, NoticePeriod, CTC)) pv

Answer 1

對於您的情況，您應該將“ Salary, NoticePeriod, CTC ”列Salary, NoticePeriod, CTC成行，然后將“ PIVOT Salary, NoticePeriod, CTC成行：

WITH Unpivoted
AS
(
    SELECT Name, Fields, SalaryValue
    FROM salaries AS s
    UNPIVOT
    (
      SalaryValue
      FOR  Fields IN(Salary, NoticePeriod, CTC)
    ) AS u
)
SELECT Fields, jack,bruce
FROM Unpivoted AS u
PIVOT
(
  MAX(SalaryValue)
  FOR Name IN(Jack, Bruce)
) AS p;

UNPIVOT會將Salary, NoticePeriod, CTC列轉換為值：

然后，數據透視表將透視每個字段值的薪水值，並將名稱轉換為列。

當然，您必須動態地執行此操作，而不是像這樣編寫名稱列表：

DECLARE @cols AS NVARCHAR(MAX);
DECLARE @colnames AS NVARCHAR(MAX);
DECLARE @query AS NVARCHAR(MAX);

SELECT @cols = STUFF((SELECT distinct ',' +
                        QUOTENAME(name)
                       FROM salaries
                      FOR XML PATH(''), TYPE
                     ).value('.', 'NVARCHAR(MAX)') 
                        , 1, 1, '');


SELECT @query = 'WITH Unpivoted
                AS
                (
                    SELECT Name, Fields, SalaryValue
                    FROM salaries AS s
                    UNPIVOT
                    (
                        SalaryValue
                        FOR  Fields IN(Salary, NoticePeriod, CTC)
                    ) AS u
                )
                SELECT Fields, ' + @cols + '
                FROM Unpivoted AS u
                PIVOT
                (
                    MAX(SalaryValue)
                    FOR Name IN(' + @cols + ')' +
                ') p';

execute(@query);

這將為您提供：

• 現場演示 （感謝@ lad2025）