SQL 旋转 Table 动态

Question

我已经很努力地了解如何在 SQL 中创建一个枢轴 table，但我做不到！

我有以下列：

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

有 600,000 行数据。

我需要在下面的枢轴中使用它们 table;

date_1 StartHour 作为列标题
link_id 作为行标题
AvJT 作为数据
使用 data_source = '1' 作为过滤器。

枢轴TABLE

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

我已经设法获得以下代码，这有效但只给我 date_1 作为列标题而不是另外的 StartHour，或者过滤器为 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

感谢您的帮助，

亨利

Answer 1

在这里，您将 select 列中的值显示为数据透视表中的列

DECLARE @cols NVARCHAR (MAX)

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

现在转向查询

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

Click here 查看结果

如果你想在列名不是动态的地方做，你可以做下面的查询

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

Click here 查看结果

编辑：

我正在为您更新的问题更新。

声明一个过滤变量data_source

DECLARE @DATASOURCE VARCHAR(20) = '1'

而不是 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

现在转向

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

Click here 查看结果

Answer 2

交叉表就是这样的。 FWIW，我建议使用比 00001a 更好的列名。为您的列名称赋予一些含义，以便它们更易于使用。

with SortedData as
(
    SELECT date_1
        , StartHour
        , AvJT
        , data_source 
        , ROW_NUMBER() over (partition by date_1 order by AvJT) AS RowNum
    FROM YourTable
)

select date_1
    , StartHour
    , MAX(case when RowNum = 1 then AvJT end) as [00001a]
    , MAX(case when RowNum = 2 then AvJT end) as [00002a]
    , MAX(case when RowNum = 3 then AvJT end) as [00003a]
    , MAX(case when RowNum = 4 then AvJT end) as [00004a]
from SortedData

SQL 旋转 Table 动态

SQL Pivot Table dynamic

sql

sql-server

pivot

sql-server-2012