sql-server - 如何在动态枢轴中将两列组合成单列

Question

我有这样的架构

demo(id, val, month, year, decide)

演示数据和模式在这个小提琴http://sqlfiddle.com/#!3/dd89d5/1中给出

在输出中，我想将行转换为列。在我想要的输出中，

ID    (11 14)  (12 14) (2 15) ...     decider
101    0.45     0.5      0.3          411
102    0.4      0.2      0.1          411

我想要对月份，年份进行排序

我经历了很多线程并找到了一个小提琴。并尝试定制以满足我的需要

这是我尝试过的 http://sqlfiddle.com/#!3/dd89d5/1

但无法得到解决方案。请帮我

Answer 1

这是你的桌子

create table demo(
    id varchar(max),    val decimal(4,2),    month int,    year int, decider int
  )

INSERT INTO demo
    ([id], [val], [month], [year], [decider])
VALUES

(101, 0.25, 11, 14, 411),
(101, 1, 12, 14, 411),
(101, 0.5, 1, 15, 411),
(101, 0.75, 2, 15, 411),
(102, 0.25, 11, 14, 411),
(102, 0.5, 12, 14, 411),
(102, 0.25, 1, 15, 411),
(101, 0.75, 11, 14, 412),
(101, 0.5, 1, 15, 412),
(101, 0.25, 2, 15, 412),
(102, 0.5, 11, 14, 412),
(102, 0.5, 12, 14, 412),
(103, 0.25, 1, 15, 412),
(103, 0.5, 11, 14, 411)
;

用于Dense_Rank对枢轴列进行排序

SELECT DENSE_RANK() OVER(ORDER BY [YEAR] ,[MONTH]) RNO,*,CAST([MONTH] AS VARCHAR) + ' ' +  CAST([YEAR] AS VARCHAR) DT
INTO #TEMP
FROM
(
    SELECT ID,SUM(VAL)VAL,[MONTH],[YEAR],DECIDER
    FROM DEMO 
    GROUP BY ID,[MONTH],[YEAR],DECIDER
)TAB

选择透视的列并声明一个变量以替换NULL为零

DECLARE @cols NVARCHAR (MAX)
DECLARE @NullToZeroCols NVARCHAR (MAX)

SELECT @cols = COALESCE (@cols + ',[' + DT + ']', 
              '[' + DT + ']')
               FROM    (SELECT DISTINCT RNO,DT FROM #TEMP) PV  
               ORDER BY RNO

SET @NullToZeroCols = SUBSTRING((SELECT ',ISNULL(['+DT+'],0) AS ['+DT+']' 
FROM(SELECT DISTINCT DT,RNO FROM #TEMP GROUP BY DT,RNO)TAB  
ORDER BY RNO  FOR XML PATH('')),2,8000)

现在转动它

DECLARE @query NVARCHAR(MAX)
SET @query = 'SELECT P.ID,' + @NullToZeroCols + ',DECIDER FROM 
             (
                 SELECT ID, DT, val,DECIDER FROM #TEMP
             ) x
             PIVOT 
             (
                 SUM(val)
                 FOR DT IN (' + @cols + ')
            ) p
            ORDER BY ID;' 

EXEC SP_EXECUTESQL @query

结果

这是小提琴http://sqlfiddle.com/#!3/95111/1（如果加载时出现任何错误，请按 RUNSQL）