SQL Server在新表中使用pivot / unpivot

Question

毋庸置疑，我试图在最近几天理解枢轴/非透视主题而没有希望。我不明白什么是枢轴，什么是不透明。我有这张桌子： 此表名为Natalie_Playground。

BuildingName    BillingMonth    Consumption

Building1       1/1/2011        59318

Building2       1/1/2011        6962

Building3       1/1/2011        204300

Building4       1/1/2011        69600

Building5       2/1/2011        47316

Building6       2/1/2011        162300

Building7       2/1/2011        7122

Building8       2/1/2011        7444

我不知道是否必须使用pivot或unpivot来使我的表看起来像这样：

BuildingName    January      February    March  .... December

Building1       59318        47316

Building2       6962         162300

Building3       204300       162300

Building4       69600        7444

Answer 1

您需要使用PIVOT函数将数据行转换为列：

select buildingname, January, February, March, April
from
(
  select buildingname,
    datename(month, billingmonth) month,
    consumption
  from yourtable
) d
pivot
(
  sum(consumption)
  for month in (January, February, March, April)
) piv;

见SQL Fiddle with Demo。 UNPIVOT函数用于获取多列并将它们转换为多行数据。