需要 SQL Server 数据透视代码帮助答案

【问题标题】：SQL Server pivot code help needed需要 SQL Server 数据透视代码帮助
【发布时间】：2017-04-26 08:52:22
【问题描述】：

我希望从此查询中转换一些数据

select 
    count(*) as total_customers,
    sum(last_year) as customers_in_last_year
    sum(two_years) as customers_in_last_2_years
from
    Customers

返回这个结果集：

total_customers    customers_in_last_year    customers_in_last_2_years
500                  100                         200

我想做的就是把它翻到下面，有什么帮助吗？

total_customers                500
customers_in_last_year         100
customers_in_last_2_years      200

谢谢

【问题讨论】：

标签： sql-server pivot unpivot

【解决方案1】：

假设您将结果存储到名为YourResult 的表中（可以是临时表、变量表），您可以执行以下操作：

select 'total_customers' as col, total_customers as val from YourResult
union all
select 'customers_in_last_year' as col, customers_in_last_year as val from YourResult
union all
select 'customers_in_last_2_years' as col, customers_in_last_2_years as val from YourResult

检查一个工作示例here。

【讨论】：

【解决方案2】：

CREATE TABLE #Table11
    ([total_customers] int, [customers_in_last_year] int, [customers_in_last_2_years] int)
;

INSERT INTO #Table11
    ([total_customers], [customers_in_last_year], [customers_in_last_2_years])
VALUES
    (500, 100, 200)


select [subject],total_customerss as  total_customers
from #Table11 s
unpivot
(
  total_customerss  
  for subject in ([total_customers], [customers_in_last_year], [customers_in_last_2_years])
) u;

输出

total_customers               500
customers_in_last_year        100
customers_in_last_2_years     200

像这样附加您的查询

SELECT [subject]
    ,total_customerss AS total_customers
FROM (
    SELECT count(*) AS total_customers
        ,sum(last_year) AS customers_in_last_year, sum(two_years) AS customers_in_last_2_years
    FROM Customers
    ) s
unpivot(total_customerss FOR subject IN (
            [total_customers]
            ,[customers_in_last_year]
            ,[customers_in_last_2_years]
            )) u;

【讨论】：