動態SQL樞軸由列的SQL Server

Question

Supossing我們n列與m行

table 1: 

someName1 someName2 someName3 ... someNameN 
---------------------------------------------- 
12.5  12.34  56.6  ... 33.2 
1.2323  12.5  57.2  ... 123.1 
2.789  45.2  766.1 ... 56.2 
45.23  34.3  7.4  ... 33.4 
52.1  4.3  89.8  ... 67.3 

如何使用動態SQL一般

輸出（A table with n rows，具有自動遞增ID，列名做表1和的總和列等）：

ID Column  Result 
-------------------------------- 
1  someName1 SUM(someName1)=12.5+1.2323+2.789+45.23+52.1 
2  someName2 SUM(someName2)=12.34+12.5+45.2+34.3+4.3 
3  someName3 SUM(someName3)=56.6+57.2+766.1+7.4+89.8 
... ... 
... ... 
N  someNameN SUM(someName3)=33.2+123.1+56.2+33.4+67.3 

凡SUM(columnName)是的所有值相加的值如何做到這一點對任何大小的任何表，其中n可能50，換句話說一個table with 50 columns？

Answer 1

它可能看起來像這樣：

declare @tableName nvarchar(128) = N'table_with_50_columns' 
declare @columnLikeFilter nvarchar(128) = N'someName%' 

declare @columns nvarchar(2000) = ''; 
declare @sumColumns nvarchar(2000) = ''; 

select @columns = @columns + COLUMN_NAME + ',', 
     @sumColumns = @sumColumns + 'sum(' + COLUMN_NAME + ') as ' + COLUMN_NAME + ',' 
from INFORMATION_SCHEMA.COLUMNS 
where TABLE_NAME = @tableName and COLUMN_NAME like @columnLikeFilter 
order by ORDINAL_POSITION ; 

set @columns = left(@columns, len(@columns) - 1) ; 
set @sumColumns = left(@sumColumns, len(@sumColumns) - 1) ; 

declare @sql nvarchar(4000) = 
    N';with cteColumnts (ORDINAL_POSITION, COLUMN_NAME) as 
    (
     select ORDINAL_POSITION, COLUMN_NAME 
     from INFORMATION_SCHEMA.COLUMNS 
     where TABLE_NAME = N'''+ @tableName + ''' and COLUMN_NAME like ''' + @columnLikeFilter + ''' 
    ), 
    cteValues (ColumnName, SumValue) as 
    (
     SELECT ColumnName, SumValue 
     FROM 
      (SELECT ' + @sumColumns + ' 
      FROM dbo.' + @tableName + ') p 
     UNPIVOT 
      (SumValue FOR ColumnName IN 
       (' + @columns + ') 
     )AS unpvt 
    ) 
    select row_number() over(order by ORDINAL_POSITION) as ID, ColumnName, SumValue 
    from cteColumnts c inner join cteValues v on COLUMN_NAME = ColumnName 
    order by ORDINAL_POSITION' 

--print @sql 

exec sp_executesql @sql