更新行基本，路徑查詢

Question

從Combine multiple rows into one "memo" nvarchar(max)

SELECT 
    DISTINCT fileref, stuff(
     (
     Select char(13)+char(10) + IsNull(D2.viaccno, '') 
     From vi_accno As D2 
     Where D2.vifileref = A.FileRef 
     For Xml Path(''), type 
     ).value('.', 'nvarchar(max)') 
     , 1, 2, '') As accno 
FROM 
    vtindex a 

如何使用上面的查詢對錶1匹配更新每個ACCNO行繼續fileref = fileref

表1： ID，fileref，客戶端，地址，登錄號

Answer 1

基於給定的數據，我可以爲您提供這樣的：

UPDATE t 
SET accno = p.accno 
FROM [table 1] t 
INNER JOIN (
SELECT 
    DISTINCT fileref, stuff(
     (
     Select char(13)+char(10) + IsNull(D2.viaccno, '') 
     From vi_accno As D2 
     Where D2.vifileref = A.FileRef 
     For Xml Path(''), type 
     ).value('.', 'nvarchar(max)') 
     , 1, 2, '') As accno 
FROM 
    vtindex a 
) as p 
ON p.fileref= t.fileref