SELECT * FROM tbiz_ProjectRelation

目標統計每個項目有幾條申請記錄

Step1

SELECT  ProjectID ,
        RelationIDs = STUFF(( SELECT ‘,‘ + CONVERT(VARCHAR,[RelationID]) FROM  tbiz_ProjectRelation t WHERE ProjectID = t1.ProjectID FOR XML PATH(‘‘)), 1, 1, ‘‘)
FROM tbiz_ProjectRelation t1

Step2

SELECT  ProjectID ,
        RelationIDs 
 
= STUFF(( SELECT ‘,‘ + CONVERT(VARCHAR,[RelationID]) FROM  tbiz_ProjectRelation t WHERE ProjectID = t1.ProjectID FOR XML PATH(‘‘)), 1, 1, ‘‘)
FROM tbiz_ProjectRelation t1 GROUP BY ProjectID

Step3

SELECT  ProjectID ,
        RelationIDs = STUFF(( SELECT ‘,‘ + CONVERT(VARCHAR,[RelationID]) FROM
 
  tbiz_ProjectRelation t WHERE ProjectID = t1.ProjectID FOR XML PATH(‘‘)), 1, 1, ‘‘),
        COUNT([RelationID]) AS [COUNT]
FROM tbiz_ProjectRelation t1 GROUP BY ProjectID

SQL多行並一行統計例子之STUFF()函數+FOR XML PATH()函數應用