PIVOT 运算符中指定的列名“FirstName”与 PIVOT 参数中的现有列名冲突

Question

当我尝试将 null 替换为 zero 时收到以下错误消息。

PIVOT 运算符中指定的列名“jan”与 PIVOT 参数中的现有列名。

以下查询：

select * from(select isnull(jan,0),isnull(feb,0),sum(data) as amount )as p
pivot(
sum(amount) for month in(jan,feb)) as piv

Answer 1

这就像错误说您的列名错误，因为它们将被读取为未命名。给他们适当的名字：

select isnull(Jan,0), isnull(feb,0) from(select sum(data) as amount, [month] 
from yourtable group by [month] )as p
pivot(
sum(amount) for [month] in(jan,feb)) as piv

Answer 2

您可以使用CTE 定义您的空值，然后像这样旋转数据：

;WITH t
AS (
    SELECT isnull(jan, 0) AS jan
        ,isnull(feb, 0) AS feb
        ,sum(data) AS amount
    FROM your_table --change this to match your table name
    GROUP BY jan,feb
    )
SELECT *
FROM (
    SELECT t.jan
        ,t.feb
        ,t.amount
    FROM t
    )
pivot(sum(amount) FOR [month] IN (
            jan
            ,feb
            )) AS piv