ms-access - 如何将一行中的字段转换为列？

Question

我有一个包含以下列的表：

          Cost     Rate

          Repair   12
          Repair   223
          Wear     1000    
          Wear     666
          Fuel     500
          Repair   600
          Fuel     450
          Wear     400

我希望这些数据作为列（修复、磨损、燃料）为：

         Repair    Wear   Fuel
           825     2066    950

我如何使用 MS Access Query 做到这一点？

Answer 1

虽然有一个非常笨拙的传统 SQL 解决方案，但阅读此页面提醒我，MS Access 有一个TRANSFORM ... PIVOT语句，您可能应该查看并使用它来执行此操作。

我不能确定，但​​它应该看起来像：

TRANSFORM Sum([Items].[Rate]) AS SumOfRate 
SELECT [Items].[Costs] 
FROM Items 
GROUP BY [Items].[Costs] 
PIVOT Format([Items].[Costs]);

它可以变得比这更漂亮。例如

PIVOT Format([Items].[month],"mmm") In ("Jan","Feb",...,"Nov","Dec");

Answer 2

未经测试但

SELECT
(SELECT  sum(rate)  from mytable where cost = 'Repair') AS Repair ,
(SELECT  sum(rate) from mytable where cost = 'Wear') AS Wear,
(SELECT  sum(rate) from mytable wherecost = 'Fuel') AS Fuel

Answer 3

您可以使用交叉表查询来执行此操作。Access Queries 窗口中有一个向导将引导您完成创建一个向导。只需单击 New Query 按钮并选择 Crosstab Query Wizard。

Answer 4

你可以使用这个查询

select 
sum(select rate from yourtable where cost = 'Repair') "Repair", 
sum(select rate from yourtable where cost = 'Wear') "Wear", 
sum(select rate from yourtable where cost = 'Fuel') "Fuel" 
from dual

如果您使用的是 Oracle

否则，如果有任何其他数据库引擎，您可以在此之前快速声明

create table dual (x char)

insert into dual values "x"

Answer 5

这将获得您需要的数据：

select cost, sum(rate)

from mytable

group by cost

然后你可以以任何你喜欢的方式呈现它。