Sql server 将空格分隔的varchar数据透视到多行（名称-值对）

我在SQLServer2008DB中有大量行

对于每一行，我有3个我关心的列

典型的行如下所示：

AccountNumber    | basecode                      | subcode
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
9689787209368901 | AQTXG AQTXG AQTXG AQTXG ACC5Z | ZQ596 ZQ596 ZQ596 ZQ655 ZC655

我需要一个SQL查询，将其转换为以下内容：

AccountNumber      |    basecode| subcode
+++++++++++++++++++++++++++++++++++++++++++
9689787209368901   |    AQTXG   | ZQ596
9689787209368901   |    AQTXG   | ZQ596
9689787209368901   |    AQTXG   | ZQ596
9689787209368901   |    AQTXG   | ZQ655
9689787209368901   |    ACC5Z   | ZC655

---

如果所有行都填充了5个序列，那么这应该可以工作

Select TableAccountNumber,SubString(basecode,1,5) as BC,SubString(Subcode,1,5) as SC
from @test
UNION ALL
Select TableAccountNumber,SubString(basecode,7,5) as BC,SubString(Subcode,7,5) as SC
from @test
UNION ALL
Select TableAccountNumber,SubString(basecode,13,5) as BC,SubString(Subcode,13,5) as SC
from @test
UNION ALL
Select TableAccountNumber,SubString(basecode,19,5) as BC,SubString(Subcode,19,5) as SC
from @test
UNION ALL
Select TableAccountNumber,SubString(basecode,25,5) as BC,SubString(Subcode,25,5) as SC
from @test

可以包装成

Select * from
(
Select TableAccountNumber,SubString(basecode,1,5) as BC,SubString(Subcode,1,5) as SC,0 as Sequence
from @test
UNION ALL
Select TableAccountNumber,SubString(basecode,7,5) as BC,SubString(Subcode,7,5) as SC,1
from @test
UNION ALL
Select TableAccountNumber,SubString(basecode,13,5) as BC,SubString(Subcode,13,5) as SC,2
from @test
UNION ALL
Select TableAccountNumber,SubString(basecode,19,5) as BC,SubString(Subcode,19,5) as SC,3
from @test
UNION ALL
Select TableAccountNumber,SubString(basecode,25,5) as BC,SubString(Subcode,25,5) as SC,4
from @test
) a
order by TableAccountNumber,Sequence

---

由于您使用的是SQL Server，因此可以使用递归查询来分割数据。在这个查询中，您可以有一个未知数量的项目被空格分割（

'

），如果您的分隔符改变，那么这很容易改变。您的查询与此类似：

;with cte (AccountNumber, basecodeItem, basecode, subcodeItem, subcode) as
(
  select AccountNumber,
    cast(left(basecode, charindex(' ',basecode+' ')-1) as varchar(50)) basecodeItem,
         stuff(basecode, 1, charindex(' ',basecode+' '), '') basecode,
    cast(left(subcode, charindex(' ',subcode+' ')-1) as varchar(50)) subcodeItem,
         stuff(subcode, 1, charindex(' ',subcode+' '), '') subcode
  from yourtable
  union all
  select AccountNumber,
    cast(left(basecode, charindex(' ',basecode+' ')-1) as varchar(50)) basecodeItem,
    stuff(basecode, 1, charindex(' ',basecode+' '), '') basecode,
    cast(left(subcode, charindex(' ',subcode+' ')-1) as varchar(50)) subcodeItem,
    stuff(subcode, 1, charindex(' ',subcode+' '), '') subcode
  from cte
  where basecode > '' or subcode > ''
)
select AccountNumber, basecodeItem, subcodeitem
from cte;

看

结果是：

|    ACCOUNTNUMBER | BASECODEITEM | SUBCODEITEM |
-------------------------------------------------
| 9689787209368900 |        AQTXG |       ZQ596 |
| 9689787209368900 |        AQTXG |       ZQ596 |
| 9689787209368900 |        AQTXG |       ZQ596 |
| 9689787209368900 |        AQTXG |       ZQ655 |
| 9689787209368900 |        ACC5Z |       ZC655 |