SQL数据透视表动态

Question

我已经尽力理解如何在SQL中创建数据透视表，但是我无法对其进行管理！

我有以下几列：

link_id   route_section   date_1    StartHour     AvJT    data_source
.......   .............  .......   ...........   ......  ............

拥有60万行数据。

我在下面的数据透视表中需要它们；

• date_1 StartHour作为列标题
• link_id 作为行标题
• AvJT 作为数据
• 其中data_source=‘1’作为过滤器。

数据透视表

Link_ID 
date_1      StartHour    00001a    000002a    000003a    000004a
20/01/2014    8           456       4657        556       46576
21/01/2014    8           511       4725        601       52154
22/01/2014    8           468       4587        458       47585
23/01/2014    8           456       4657        556       46576
24/01/2014    8           456       4657        556       46576
25/01/2014    8           456       4657        556       46576
26/01/2014    8           456       4657        556       46576

我设法获得了以下代码，该方法有效，但仅给我date_1作为列标题，而不给我StartHour，或者将filter作为date_source =‘1’。

    Use [C1_20132014]

DECLARE @DynamicPivotQuery AS NVARCHAR(MAX)
DECLARE @ColumnName AS NVARCHAR(MAX)

--Get distinct values of the PIVOT Column 
SELECT @ColumnName= ISNULL(@ColumnName + ',','') 
       + QUOTENAME(Link_ID)
FROM (SELECT DISTINCT Link_ID FROM C1_May_Routes) AS Link_ID

--Prepare the PIVOT query using the dynamic 
SET @DynamicPivotQuery = 
  N'SELECT Date_1, ' + @ColumnName + '
    FROM C1_May_Routes
    PIVOT(SUM(AvJT) 
          FOR Link_ID IN (' + @ColumnName + ')) AS PVTTable'
--Execute the Dynamic Pivot Query
EXEC sp_executesql @DynamicPivotQuery

谢谢你的帮助，

亨利

Answer 1

在这里，您将选择一列中的值以在数据透视图中显示为一列

DECLARE @cols NVARCHAR (MAX)

SELECT @cols = COALESCE (@cols + ',[' + AvJT + ']', '[' + AvJT + ']')
               FROM    (SELECT DISTINCT AvJT FROM YourTable) PV  
               ORDER BY AvJT

现在旋转查询

DECLARE @query NVARCHAR(MAX)
SET @query = 'SELECT * FROM 
             (
                 SELECT date_1, StartHour,AvJT, data_source 
                 FROM YourTable
             ) x
             PIVOT 
             (
                 -- Values in each dynamic column
                 SUM(data_source)
                 FOR AvJT IN (' + @cols + ')                      
            ) p;'

EXEC SP_EXECUTESQL @query

• 点击这里查看结果

如果要对列名称不是动态的地方执行此操作，则可以执行以下查询

SELECT DATE_1,STARTHOUR,
MIN(CASE WHEN AvJT='00001a' THEN data_source END) [00001a],
MIN(CASE WHEN AvJT='00002a' THEN data_source END) [00002a],
MIN(CASE WHEN AvJT='00003a' THEN data_source END) [00003a],
MIN(CASE WHEN AvJT='00004a' THEN data_source END) [00004a]
FROM YOURTABLE
GROUP BY  DATE_1,STARTHOUR

• 点击这里查看结果

编辑 ：

我正在为您更新的问题进行更新。

声明一个变量进行过滤 data_source

DECLARE @DATASOURCE VARCHAR(20) = '1'

代替QUOTENAME，您可以使用另一种格式来获取数据透视表的列

DECLARE @cols NVARCHAR (MAX)

SELECT @cols = COALESCE (@cols + ',[' + Link_ID + ']', '[' + Link_ID + ']')
               FROM    (SELECT DISTINCT Link_ID FROM C1_May_Routes WHERE data_source=@DATASOURCE) PV  
               ORDER BY Link_ID

现在枢纽

DECLARE @query NVARCHAR(MAX)
SET @query = 'SELECT * FROM 
             (
                 -- We will select the data that has to be shown for pivoting
                 -- with filtered data_source
                 SELECT date_1, StartHour,AvJT, Link_ID
                 FROM C1_May_Routes
                 WHERE data_source = '+@DATASOURCE+'
             ) x
             PIVOT 
             (
                 -- Values in each dynamic column
                 SUM(AvJT)
                 -- Select columns from @cols 
                 FOR Link_ID IN (' + @cols + ')                      
            ) p;'

EXEC SP_EXECUTESQL @query

• 点击这里查看结果