Question

我有以下内容：

＆＃xA;＆＃xA;

  Country | StateCity＆＃xA; -------- + ------------＆＃xA; USA | MO＆＃xA;美国| LA＆＃xA;美国| OH＆＃xA;加拿大|安大略省＆＃xA;加拿大|多伦多＆＃xA;

＆＃xA;＆＃xA;

我希望转换和统一标题，结果如

＆＃xA;＆＃xA;

  USA CANADA＆＃xA; MO Ontario＆＃xA; LA Toronto＆＃xA; OH＆＃xA;

＆＃xA;

Answer 1

假设你不想去DYNAMIC

Declare @YourTable table (Country varchar(25),StateCity varchar(25))
Insert Into @YourTable values 
('USA','MO'),
('USA','LA'),
('USA','OH'),
('CANADA','Ontario'),
('CANADA','Toronto')

Select USA   =max(case when Country='USA'    then StateCity else '' end)
      ,CANADA=max(case when Country='CANADA' then StateCity else '' end)
 From ( Select *
              ,RowNr=Row_Number() over (Partition By Country Order By (Select NULL)) 
         From  @YourTable
       ) A
 Group By RowNr

返回

USA CANADA
MO  Ontario
LA  Toronto
OH

Answer 2

但如果你想要DYNAMIC： Sql DEMO

首先，您需要一个时态表来创建row_id

SELECT row_number() over (partition by [Country] order by [StateCity]) [rn], 
       [StateCity],
       [Country]
INTO temp
FROM State;

然后你可以去动态枢轴路线

创建不同的列

SET @cols = STUFF((SELECT distinct ',' + QUOTENAME(c.[Country]) 
            FROM temp c
            FOR XML PATH(''), TYPE
            ).value('.', 'NVARCHAR(MAX)') 
        ,1,1,'')

创建透视查询：

set @query = 'SELECT rn, ' + @cols + ' from 
            (
                select [rn]
                     , [StateCity]
                     , [Country]
                from temp
           ) x
            pivot 
            (
                 max(StateCity)
                for [Country] in (' + @cols + ')
            ) p ';

执行

execute(@query);

<强>输出：

Answer 3

这更像是客户端问题。您要查找的结果不是数据库查询生成的结果。下面的查询会让您更接近并且需要更少的格式化客户端，但是，如果没有迭代处理，您将不会得到类似的结果集。

SELECT
    USA=CASE WHEN Country='USA' THEN StateCity ELSE NULL END,
    CANADA=CASE WHEN Country='CANADA' THEN StateCity ELSE NULL END
FROM
(
    SELECT DISTINCT Country,StateCity FROM Table WHERE Country IN('USA','CANADA')
)AS X

Answer 4

出于测试目的：

CREATE TABLE dbo.Country (
    Country VARCHAR(10),
    StateCity VARCHAR(10)
);

INSERT INTO dbo.Country (Country, StateCity) VALUES ('USA', 'MO');
INSERT INTO dbo.Country (Country, StateCity) VALUES ('USA', 'LA');
INSERT INTO dbo.Country (Country, StateCity) VALUES ('USA', 'OH');
INSERT INTO dbo.Country (Country, StateCity) VALUES ('CANADA', 'Ontario');
INSERT INTO dbo.Country (Country, StateCity) VALUES ('CANADA', 'Toronto');

您可以使用以下解决方案之一：

PIVOT

- 关注

CASE（我仍在努力合并结果以摆脱NULLS）

SELECT 
    USA, 
    CANADA 
FROM 
(
    SELECT 
        CASE WHEN Country='USA' THEN StateCity END AS USA,
        CASE WHEN Country='CANADA' THEN StateCity END AS CANADA
    FROM 
        dbo.Country
) A
    GROUP BY 
        USA, 
        CANADA;

在SQL Server 2012中进行转置

4 个答案: