Question

我们拥有n行<{1}}行

如何使用动态SQL来执行

输出（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，包含，自动增量ID，Table1的列名和列的总和，如下所示：

A table with n rows

其中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是对SUM(columnName)的所有值求和的值。如何对任何表的任何大小执行此操作，其中Table 1,可以是n，换句话说一个50 ??

Answer 1

可能看起来像这样：

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

列SQL Server的动态SQL数据透视表

1 个答案: