Question

我正在尝试根据其他列中相同的数据将一列数据拆分为多个（必要时在1到5之间）。
这是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拥有多个帐户的事实，最多可达5个帐户。

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。我想只创建5个新列，任何空字段都是NULL值。有人可以帮忙吗？

Answer 1

你可以使用简单的支点：

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;

或者您可以手动转动：

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]

<强> sql fiddle demo

SQL Server将一列拆分为多列

1 个答案: