多行成列，列值按SQL Server中的列分组

Question

如何通过以下方式将行转换为列组：

所需的结果将是这样的：

Answer 1

如果您有指定顺序的列，则可以使用条件聚合：

select max(case when columnname = 'SupplierGSTin' then value end) as SupplierGSTin,
       max(case when columnname = 'DocumentNumber' then value end) as DocumentNumber,
       max(case when columnname = 'SupplyType' then value end) as SupplyType
from (select t.*,
             row_number() over (partition by columnname order by ?) as seqnum
      from t
     ) t
group by rownum;

?用于指定顺序的列。