SQL查询动态表的转置

Question

sql表如下，

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

它包含大约1000行。

我需要对该表进行转置，以使预期输出为

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

我尝试在Sql Server 2008中使用Pivot和Unpivot函数。 但是由于Name记录很大，所以Pivot查询没有帮助。

我的SQL尝试如下

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

对于您的情况，您应该将“ Salary, NoticePeriod, CTC ”列Salary, NoticePeriod, CTC成行，然后将“ 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会将Salary, NoticePeriod, CTC列转换为值：

然后，数据透视表将透视每个字段值的薪水值，并将名称转换为列。

当然，您必须动态地执行此操作，而不是像这样编写名称列表：

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);

这将为您提供：

• 现场演示 （感谢@ lad2025）