SQL Server将一列拆分为多列

我试图将一列数据拆分为多列（必要时介于1和5之间），因为其他列中的数据相同。
这是一个查询后我的数据示例：

FirstName    LastName    StreetName    StreetNumber    AccountNumber
John         Smith       Fake St       123             10
John         Smith       Fake St       123             20
John         Smith       Fake St       123             30
John         Smith       Fake St       123             40

这是基于同一地址的同一个人可以有多个帐户，最多5个。我需要的结果是：

FirstName    LastName    StreetName    StreetNumber    AccountNumber1    AccountNumber2    AccountNumber3    AccountNumber4    AccountNumber5
John         Smith       Fake St       123             10                20                30                40                NULL

---

因此，我需要根据名称/地址相同的条件将accountNumber列拆分为多个列。我只想创建5个新列，任何空字段都是空值。有人能帮忙吗？

您可以使用简单的pivot：

with cte as (
    select
        *,
        'AccountNumber' + 
        cast(
          row_number()
          over(
              partition by [FirstName], [LastName], [StreetName], [StreetNumber]
              order by AccountNumber
          )
        as nvarchar(max)) as rn
    from Table1
)
select *
from cte
pivot (
    max(AccountNumber)
    for rn in (
        [AccountNumber1],
        [AccountNumber2],
        [AccountNumber3],
        [AccountNumber4],
        [AccountNumber5]
    )
) as p;

或者您可以用手转动轴：

with cte as (
    select
        *,
        row_number()
        over(
            partition by [FirstName], [LastName], [StreetName], [StreetNumber]
            order by AccountNumber
        ) as rn
    from Table1
)
select
    [FirstName], [LastName], [StreetName], [StreetNumber],
    max(case when rn = 1 then AccountNumber end) as AccountNumber1,
    max(case when rn = 2 then AccountNumber end) as AccountNumber2,
    max(case when rn = 3 then AccountNumber end) as AccountNumber3,
    max(case when rn = 4 then AccountNumber end) as AccountNumber4,
    max(case when rn = 5 then AccountNumber end) as AccountNumber5
from cte
group by [FirstName], [LastName], [StreetName], [StreetNumber]