将地址行填充到一组标准列中

Question

我正在尝试确定如何在 SQL Server 查询中清理和填充一组地址行。 （需要兼容 SQL Server 2008 及更高版本）

我有 5 个地址行 Addr1 - Addr5，我想在查询中将它们输出到 4 个连续填充的列中。如果 N 个地址不为空，则应填充最终地址 FAddr1 到 FAddrN。 （任何剩余的列都应该为空。如果所有 5 个地址行都已填充，则最后一个被删除。）

请注意，稍后我可能会添加第 6 个 Addr 列，但这并不需要对任何 N 列进行通用解决。 （6 Addr 列应该是最大值。）数据无法事先标准化，所以我必须以最快的方式即时执行此操作。

复杂性在于如何将地址行列“向左”移动以覆盖空白列。

这是一个例子：

Addr1           Addr2           Addr3           Addr4           Addr5           
--------------------------------------------------------------------------------
                101 Main St     Apt 1           Here, AZ 11111  USA
                102 Main St                     Here, AZ 22222
103 Main St     Apt 3           Here, AZ 33333  USA
104 Main St                                     Here, AZ 44444  USA

对于这些示例，我想输出：

FAddr1          FAddr2          FAddr3          FAddr4          
----------------------------------------------------------------
101 Main St     Apt 1           Here, AZ 11111
102 Main St     Here, AZ 22222
103 Main St     Apt 3           Here, AZ 33333  USA
104 Main St     Here, AZ 44444  USA

我是用 C# 编写的，但复杂性在于以一种简洁的方式在 SQL 中执行此操作。通过连接成一个字符串来实现这一点要容易得多（请参阅下面的相关问题）。但我需要将这些放在 4 个单独的列中。

相关问题： Most Similar Question - Different Use Case/Similar But With String Instead of Columns

初始版本：

我在 SQL 中使用了一个似乎可以正常工作的测试用例编写了以下版本，但我希望有一种更简洁的方法。这基本上会不断移动非空元素。但是每列需要一个子选择才能将所有内容向左移动。

Select
    Addr1,
    case when Addr2 is null then Addr3 else Addr2 end as Addr2,
    case when Addr2 is null then null else Addr3 end as Addr3,
    case when Addr4 is null then Addr5 else Addr4 end as Addr4
    -- Truncate to 4 - case when Addr4 is null then null else Addr5 end as Addr5
From
(
Select
    case when Addr1 is null then Addr2 else Addr1 end as Addr1,
    case when Addr1 is null then null else Addr2 end as Addr2,
    case when Addr3 is null then Addr4 else Addr3 end as Addr3,
    case when Addr3 is null then null else Addr4 end as Addr4,
    Addr5
From
(
Select
    Addr1,
    case when Addr2 is null then Addr3 else Addr2 end as Addr2,
    case when Addr2 is null then null else Addr3 end as Addr3,
    case when Addr4 is null then Addr5 else Addr4 end as Addr4,
    case when Addr4 is null then null else Addr5 end as Addr5
From
(
Select
    case when Addr1 is null then Addr2 else Addr1 end as Addr1,
    case when Addr1 is null then null else Addr2 end as Addr2,
    case when Addr3 is null then Addr4 else Addr3 end as Addr3,
    case when Addr3 is null then null else Addr4 end as Addr4,
    Addr5
From
(
Select
    Addr1,
    case when Addr2 is null then Addr3 else Addr2 end as Addr2,
    case when Addr2 is null then null else Addr3 end as Addr3,
    case when Addr4 is null then Addr5 else Addr4 end as Addr4,
    case when Addr4 is null then null else Addr5 end as Addr5
From
(
    SELECT NULL as Addr1, NULL as Addr2, NULL as Addr3, NULL as Addr4, NULL  as Addr5 UNION
    SELECT NULL, NULL, NULL, NULL,  '5' UNION
    SELECT NULL, NULL, NULL,  '4', NULL UNION
    SELECT NULL, NULL, NULL,  '4',  '5' UNION
    SELECT NULL, NULL,  '3', NULL, NULL UNION
    SELECT NULL, NULL,  '3', NULL,  '5' UNION
    SELECT NULL, NULL,  '3',  '4', NULL UNION
    SELECT NULL, NULL,  '3',  '4',  '5' UNION
    SELECT NULL,  '2', NULL, NULL, NULL UNION
    SELECT NULL,  '2', NULL, NULL,  '5' UNION
    SELECT NULL,  '2', NULL,  '4', NULL UNION
    SELECT NULL,  '2', NULL,  '4',  '5' UNION
    SELECT NULL,  '2',  '3', NULL, NULL UNION
    SELECT NULL,  '2',  '3', NULL,  '5' UNION
    SELECT NULL,  '2',  '3',  '4', NULL UNION
    SELECT NULL,  '2',  '3',  '4',  '5' UNION
    SELECT  '1', NULL, NULL, NULL, NULL UNION
    SELECT  '1', NULL, NULL, NULL,  '5' UNION
    SELECT  '1', NULL, NULL,  '4', NULL UNION
    SELECT  '1', NULL, NULL,  '4',  '5' UNION
    SELECT  '1', NULL,  '3', NULL, NULL UNION
    SELECT  '1', NULL,  '3', NULL,  '5' UNION
    SELECT  '1', NULL,  '3',  '4', NULL UNION
    SELECT  '1', NULL,  '3',  '4',  '5' UNION
    SELECT  '1',  '2', NULL, NULL, NULL UNION
    SELECT  '1',  '2', NULL, NULL,  '5' UNION
    SELECT  '1',  '2', NULL,  '4', NULL UNION
    SELECT  '1',  '2', NULL,  '4',  '5' UNION
    SELECT  '1',  '2',  '3', NULL, NULL UNION
    SELECT  '1',  '2',  '3', NULL,  '5' UNION
    SELECT  '1',  '2',  '3',  '4', NULL UNION
    SELECT  '1',  '2',  '3',  '4',  '5'
) as Base
) as Pass1 ) as Pass2 ) as Pass3 ) as Pass4

Answer 1

这应该适合你：

with Temp1 (AddrStr) as (
select
TRIM(CONCAT( Addr1 + ', ', Addr2 + ', ', Addr3 + ', ', Addr4 + ', ', Addr5)) AS [AddrStr]
From
(
... code to select the 5 address columns

)
) 
as base
)
select
AddrStr
,REVERSE(PARSENAME(REPLACE(REVERSE(AddrStr), ',', '.'), 1)) AS [Addr1]
,REVERSE(PARSENAME(REPLACE(REVERSE(AddrStr), ',', '.'), 2)) AS [Addr2]
,REVERSE(PARSENAME(REPLACE(REVERSE(AddrStr), ',', '.'), 3)) AS [Addr3]
,REVERSE(PARSENAME(REPLACE(REVERSE(AddrStr), ',', '.'), 4)) AS [Addr4]
,REVERSE(PARSENAME(REPLACE(REVERSE(AddrStr), ',', '.'), 5)) AS [Addr5]
From Temp1

当然，您可以通过将 REVERSE... 语句中的“AddrStr”替换为 TRIM(CONCAT ... 语句来简化此操作 - 但为了清楚起见，我将其分为 2 个步骤，例如

,REVERSE(PARSENAME(REPLACE(REVERSE(TRIM(CONCAT( Addr1 + ', ', Addr2 + ', ', Addr3 + ', ', Addr4 + ', ', Addr5))), ',', '.'), 1)) AS [Addr1]

Answer 2

您可以在这里使用apply：

select b.*, v.*
from base b cross apply
     (select max(case when v.seqnum = 1 then v.addr end) as faddr1,
             max(case when v.seqnum = 2 then v.addr end) as faddr2,
             max(case when v.seqnum = 3 then v.addr end) as faddr3,
             max(case when v.seqnum = 4 then v.addr end) as faddr4,
             max(case when v.seqnum = 5 then v.addr end) as faddr5
      from (select v.*, row_number() over (order by ord) as seqnum
            from (values (b.addr1, 1), (b.addr2, 2), (b.addr3, 3), (b.addr4, 4), (b.addr5, 5)
                 ) v(addr, ord)
            where v.addr is not null
           ) v
      ) v;