如何改善此邮寄地址SQL Server SELECT语句？

Question

如何设置邮寄地址的格式，以便始终将所有非空行都推到顶部？也就是说，我想将地址从下面的结构转换为邮寄地址。

结构如下：

[Line1] [varchar](50) NULL,
[Line2] [varchar](50) NULL,
[Line3] [varchar](50) NULL,
[City] [varchar](50) NULL,
[State] [varchar] (2) NULL,
[PostalCode] [varchar](50) NULL,

以下是一些示例数据：

Line1=
Line2=123 Some Address
Line3=
City=Royal Oak
State=MI
ZIP=45673-2312

结果如下所示 （应返回4个不同的字段） ：

MailAddress1=123 Some Address
MailAddress2=ROYAL OAK MI 45673-2312
MailAddress3=
MailAddress4=

我正在使用SQL Server 2005。

有人在我们公司写了这个逻辑，看起来似乎很复杂（注意：这不是整个SELECT语句）：

,CASE 
  WHEN eai.Line1 IS NULL OR eai.Line1 = '' THEN 
    CASE 
      WHEN eai.Line2 IS NULL OR eai.Line2 = '' THEN 
        CASE 
          WHEN eai.Line3 IS NULL OR eai.Line3 = '' THEN ISNULL(LTRIM(RTRIM(eai.City)),'') + ' ' + ISNULL(LTRIM(RTRIM(eai.RegionCode)),'') + '  ' + ISNULL(LTRIM(RTRIM(eai.PostalCode)),'')
          ELSE eai.Line3
          END
      ELSE eai.Line2
      END
  ELSE eai.Line1
  END
,CASE 
  WHEN eai.Line1 IS NULL OR eai.Line1 = '' THEN
    CASE 
      WHEN eai.Line3 IS NULL OR eai.Line3 = '' THEN ISNULL(LTRIM(RTRIM(eai.City)),'') + ' ' + ISNULL(LTRIM(RTRIM(eai.RegionCode)),'') + '  ' + ISNULL(LTRIM(RTRIM(eai.PostalCode)),'')
      ELSE eai.Line3
      END
  ELSE 
    CASE 
      WHEN eai.Line2 IS NULL OR eai.Line2 = '' THEN 
        CASE 
          WHEN eai.Line3 IS NULL OR eai.Line3 = '' THEN ISNULL(LTRIM(RTRIM(eai.City)),'') + ' ' + ISNULL(LTRIM(RTRIM(eai.RegionCode)),'') + '  ' + ISNULL(LTRIM(RTRIM(eai.PostalCode)),'')
          ELSE eai.Line3
          END
      ELSE eai.Line2
      END
  END
,CASE
  WHEN eai.Line1 IS NULL OR eai.Line1 = '' THEN
    CASE 
      WHEN eai.Line2 IS NULL OR eai.Line2 = '' THEN NULL
      ELSE
        CASE 
          WHEN eai.Line3 IS NULL OR eai.Line3 = '' THEN NULL
          ELSE ISNULL(LTRIM(RTRIM(eai.City)),'') + ' ' + ISNULL(LTRIM(RTRIM(eai.RegionCode)),'') + '  ' + ISNULL(LTRIM(RTRIM(eai.PostalCode)),'')
          END
      END 
  ELSE
    CASE 
      WHEN eai.Line2 IS NULL OR eai.Line2 = '' THEN 
        CASE 
          WHEN eai.Line3 IS NULL OR eai.Line3 = '' THEN NULL
          ELSE ISNULL(LTRIM(RTRIM(eai.City)),'') + ' ' + ISNULL(LTRIM(RTRIM(eai.RegionCode)),'') + '  ' + ISNULL(LTRIM(RTRIM(eai.PostalCode)),'')
          END
      ELSE 
          CASE 
            WHEN eai.Line3 IS NULL OR eai.Line3 = '' THEN ISNULL(LTRIM(RTRIM(eai.City)),'') + ' ' + ISNULL(LTRIM(RTRIM(eai.RegionCode)),'') + '  ' + ISNULL(LTRIM(RTRIM(eai.PostalCode)),'')
            ELSE eai.Line3
            END
      END
  END
,CASE WHEN eai.Line2 IS NOT NULL AND eai.Line2 <> '' AND eai.Line3 IS NOT NULL AND eai.Line3 <> '' THEN eai.City + ' ' + eai.RegionCode + '  ' + eai.PostalCode ELSE NULL END

Answer 1

这样做的方法是使用UNPIVOT。解决方法如下：

With AddrTable as (
Select AddrFld, MailAddr From (
Select Cast(ISNULL([Line1], '') as Varchar(102)) as [A1], 
       Cast(ISNULL([Line2], '') as Varchar(102)) as [A2], 
       Cast(ISNULL([Line3], '') as Varchar(102)) as [A3], 
       Cast(ISNULL(LTRIM(RTRIM(City)),'') + ' ' + ISNULL(LTRIM(RTRIM(RegionCode)),'') + '  ' + ISNULL(LTRIM(RTRIM(PostalCode)),'') as Varchar(102)) as A4
From TableName Where UniqueID=@UniqueID) p
Unpivot (MailAddr For AddrFld in ([A1], [A2], [A3], [A4])) as unpvt)
Select Row_Number() over (Order by (Case Len(MailAddr) When 0 then 1 else 0 end), AddrFld) as RN, 
MailAddr From AddrTable 
Order By RN

这是输出：

Address1
Westby WI  55555
-empty line-
-empty line-

请注意，我必须使用“
Varchar（102）”作为字段长度（unpivot要求所有字段都相同），因为您的城市/地区/邮政总计最多可以包含102个字符。另外，请注意，“ @
UniqueID”是您需要其地址的记录的标识符。这将返回四个总是4 行 包含您需要为您的地址中的数据。

更新： 如果需要将其作为一组四 列 而不是四行返回，则只需将其放入视图中，然后使用 Pivot
查询该视图。我在此处包括该视图是出于完整性的考虑，因为在创建视图时我不得不对上述内容进行一些更改，因此包括了uniqueID字段，并且未进行任何排序（该排序已在查询中完成）：

Create View AddressRows AS
 With AddrTable as (
 Select UniqueID, AddrFld, MailAddr From (
 Select UniqueID, 
       Cast(ISNULL([Line1], '') as Varchar(102)) as [A1], 
       Cast(ISNULL([Line2], '') as Varchar(102)) as [A2], 
       Cast(ISNULL([Line3], '') as Varchar(102)) as [A3], 
       Cast(ISNULL(LTRIM(RTRIM(City)),'') + ' ' + ISNULL(LTRIM(RTRIM(RegionCode)),'') + '  ' + ISNULL(LTRIM(RTRIM(PostalCode)),'') as Varchar(102)) as A4
 From TableName Where UniqueID=@UniqueID) p
 Unpivot (MailAddr For AddrFld in ([A1], [A2], [A3], [A4])) as unpvt)
 Select UniqueID, 
       Row_Number() over (Order by (Case Len(MailAddr) When 0 then 1 else 0 end), AddrFld) as RN, 
       MailAddr From AddrTable

然后，当您想拉出匹配的“行”时，请使用此SQL将其回退（注意，我正在使用UniqueID再次查询）：

Select [Addr1], [Addr2], [Addr3], [Addr4] From (
Select Top 4 'Addr' + Cast(Row_Number() over (Order by RN) as Varchar(12)) as AddrCol,  -- "Top 4" needed so we can sneak the "Order By" in 
MailAddr 
From AddressRows Where UniqueID=@UniqueID
) p PIVOT (Max([MailAddr]) for AddrCol in ([Addr1], [Addr2], [Addr3], [Addr4])
) as pvt

这将返回：

Addr1            Addr2                Addr3           Addr4
--------------   ------------------   -------------   ------------------ 
Address1         Westby WI  54667