Question

我知道有很多文章向您展示如何PIVOT数据并返回不同的输出，但我真的在努力解决这个问题。我需要将呈现为多行的数据转换为单行。

我的表格包含以下内容

RefNo   | Title | FirstName | LastName  | DOB        | TelNumber | MultipleAcounts
2211700 | Mr    | Marshal   | Seaton    |03/12/1980  | 012365487 | J
2211700 | Mrs   | Dallas    | Seaton    |01/01/1978  | 012345697 | J

将其转换为

RefNo   | Title | FirstName | LastName  | DOB        | TelNumber | MultipleAcounts | J Title    | J FirstName | J Surname | J DOB      | J TEl     | J 
2211700 | Mr    | Marshal   | Seaton    |03/12/1980  | 012365487 | J               | Mrs    | Dallas      | Seaton    |01/01/1978  | 012345697 | J

我已经完成了几个不同的连接但总是以重复数据结束。

Answer 1

这是一种方法。这仅在您知道每个RefNo最多只有2行时才有效。

declare @Something table
(
    RefNo int
    , Title varchar(5)
    , FirstName varchar(25)
    , LastName varchar(25)
    , DOB date
    , TelNumber varchar(10)
    , MultipleAcounts char(1)
)
insert @Something
select 2211700, 'Mr', 'Marshal', 'Seaton', '03/12/1980', '012365487', 'J' union all
select 2211700, 'Mrs', 'Dallas', 'Seaton', '01/01/1978', '012345697', 'J';

with SortedVals as
(
    select *
    , ROW_NUMBER() over (partition by RefNo order by Title) as RowNum
    from @Something
)

select RefNo
    , MAX(case RowNum when 1 then Title end) as Title
    , MAX(case RowNum when 1 then FirstName end) as FirstName
    , MAX(case RowNum when 1 then DOB end) as DOB
    , MAX(case RowNum when 1 then TelNumber end) as TelNumber
    , MAX(case RowNum when 1 then MultipleAcounts end) as MultipleAcounts
    , MAX(case RowNum when 2 then Title end) as Title2
    , MAX(case RowNum when 2 then FirstName end) as FirstName2
    , MAX(case RowNum when 2 then DOB end) as DOB2
    , MAX(case RowNum when 2 then TelNumber end) as TelNumber2
    , MAX(case RowNum when 2 then MultipleAcounts end) as MultipleAcounts2
from SortedVals
group by RefNo

如果你想了解更多关于这种方法的信息，或者如果你需要一个动态版本，这里有两篇关于这种技术的文章。

Cross Tabs and Pivots, Part 1 – Converting Rows to Columns

Cross Tabs and Pivots, Part 2 - Dynamic Cross Tabs

将联合帐户合并为单行SQL 2008

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