SQL创建连接字符串

我有一个名为service entry的表，我试图创建一个连接字符串

ID  ServiceEntryID  PartID  Comment  ServiceTypeIDs  PartDescription
1        2           54      xyz      1               hellothere
2        2           22                               howdy
3        33          54      uhu      1               xyz

所需的字符串格式

PartID~PartDescription~ServiceTypeIDs~注释

所需字符串值

因此，对于值为2的服务条目ID列：

54~你好~1~xyz|22~你好~null~|

对于值为33的服务条目ID列：

33~xyz~1~uhu

如果条目没有注释，则我不会为其添加null，而如果ServiceTypeId为空，则我将添加null

Select   coalesce(partID,'NULL') +'~'+ 
coalesce(PartDescription,'NULL') +'~'+ 
 coalesce(ServiceTypeIDs,'NULL') +'~'+
 coalesce(Comment,'NULL') as DesiredStringFormat
FROM yourTableName

当任何字段为空时，上述内容将替换为“空”

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只需将每个字符串包装到concat中的一个联合（comment，'null'）语句中即可。thnak用于您的注释和answers@tamtam很高兴听到这个消息：D

SELECT
     ServiceEntryID,
     STUFF(
         (SELECT '|' + CAST(PartID AS VARCHAR(5)) + '~' +
                       PartDescription  + '~' +
                       COALESCE(CAST(ServiceTypeIDs AS VARCHAR(5)), 'NULL')  + '~' +
                       COALESCE(Comment, 'NULL')
          FROM TableName
          WHERE ServiceEntryID = a.ServiceEntryID
          FOR XML PATH (''))
          , 1, 1, '')  AS ResultList
FROM TableName AS a
WHERE ServiceEntryID = 2
GROUP BY ServiceEntryID