1

我正在尝试连接三个表并将 2 个不同的列连接成多行。当我运行具有多个文件名和多个电话号码的常规查询时，我有四列数据。我想摆脱查询导致的重复项。

我希望不将 id 与不同的文件名重复连接到另一列中，以便 id 用逗号分隔。将所有电话号码与相应的 id 连接成一行并用逗号分隔的情况也是如此。

我发现了一些使用 xml 路径的示例，但它们只有两个表和两列。

下面我有三个表，我到目前为止的查询，以及我希望有的查询。有谁知道在加入表格时如何做嵌套的 xml 路径？

Table: IPMFILE
ID FILENAME
10000.000 10000_45109.doc
10001.000 10001_45115.docx
10002.000 10002_47752.doc
10002.000 10002_45119.doc
10003.000 10003_45123.doc
10004.000 10004_45128.docx
10004.000 10004_45183.docx

表：人员
ID CITY
10000.000 Elkins Park
10001.000 4504 St. James Drive Plano
10002.000 Fort Collins
10003.000 Bound Brook
10004.000 Downers Grove

表：电话
ID 电话
10000.000 215-7177179
10001.000 972-6187143
10002.000 970-4439376
10003.000 家 732-3693106
10004.000 C 630-4648539
60048539 1000481603-

SELECT PERSONS.ID, impfile.FILENAME, phonenumbers.phone, PERSONS.CITY 
FROM IMPFILE, Persons, Phonenumbers WHERE impfile.ID=Persons.ID 
AND phonenumbers.id=persons.id AND PERSONS.ID 
BETWEEN 10000 AND 10004 order by person



Result of Query
ID FILENAME phone CITY
10000.000 10000_45109.doc 215-7177179 Elkins Park
10001.000 10001_45115.docx 972-6187143 4504 St. James Drive Plano
10002.000 10002_47752.doc, 970-4439376 Fort Collins
10002.000 10002_45119.doc 970-4439376 Fort Collins
10003.000 10003_45123 .doc 主页 732-3693106 Bound Brook
10004.000 10004_45128.docx C 630-4648539 Downers Grove
10004.000 10004_45183.docx C 630-4648539 Downers Grove
10004.000 10004_45128.docx H 630-9681673 Downers Grove
10004.000 10004_45183.docx H 630-9681673 Downers Grove

Desired Query with Filename Concatenated for each id and Phone number concatenated for each id and duplicates removed
ID FILENAME phone CITY
10000.000 10000_45109.doc 215-7177179 Elkins Park
10001.000 10001_45115.docx 972-6187143 4504 St. James Drive Plano
10002.000 10002_47752.doc, 10002_45119 .doc 970-4439376 Fort Collins
10003.000 10003_45123.doc Home 732-3693106 Bound Brook
10004.000 10004_45128.docx, 10004_45183.docxC 630-4648539,H 630-9681673 Downers Grove

我在另一篇文章中找到了这个：

SELECT * 
FROM   ThisTable 
   OUTER APPLY (SELECT (SELECT SomeField + ' ' AS [data()] 
                        FROM   SomeTable 
                        WHERE  SomeTable.ID = ThisTable.ID 
                        FOR XML PATH ('')) AS ConcatenatedSomeField) A 
   OUTER APPLY (SELECT (SELECT SomeField2 + ' ' AS [data()] 
                        FROM   SomeTable 
                        WHERE  SomeTable.ID = ThisTable.ID 
                        FOR XML PATH ('')) AS ConcatenatedSomeField2) B 
   OUTER APPLY (SELECT (SELECT SomeField3 + ' ' AS [data()] 
                        FROM   SomeTable 
                        WHERE  SomeTable.ID = ThisTable.ID 
                        FOR XML PATH ('')) AS ConcatenatedSomeField3) C
4

1 回答 1

0

这是答案。您需要在此处添加 WHERE 子句。我还发现您提供的代码中存在一些不匹配：例如 ORDER BY person - 提供的表中没有这样的列。

SELECT p.ID
  , imp.FILENAME
  , pn.phone
  , p.CITY 
FROM (
      SELECT DISTINCT ID,
              STUFF(( SELECT ',' + IPM.FILENAME AS [text()]
                      FROM IPMFILE AS IPM
                      WHERE IPM.ID = I.ID
                      FOR XML PATH('') 
                        ), 1, 1, '' )
            AS [Filename]
      FROM IPMFILE AS I
      ) as imp 
INNER JOIN Persons as p
  ON imp.ID=p.ID 
INNER JOIN (
      SELECT DISTINCT ID,
              STUFF(( SELECT ',' + p2.phone AS [text()]
                      FROM Phonenumbers AS p2
                      WHERE p2.ID = p1.ID
                      FOR XML PATH('') 
                        ), 1, 1, '' )
            AS [phone]
      FROM Phonenumbers AS p1
      ) as pn
  ON pn.id=p.id
ORDER BY p.id

关于子选择的一点解释。在这一部分中，我们按 ID 将行收集到一行中：

SELECT ',' + p2.phone AS [text()]
FROM Phonenumbers AS p2
WHERE p2.ID = p1.ID 
FOR XML PATH('')

之后我们使用函数STUFF从收集的行中删除最后一个逗号。

您也可以在这里找到示例http://sqlfiddle.com/#!6/c9fc6/17

于 2014-05-26T07:07:14.567 回答