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SQL多行并一行统计例子之STUFF()函数+FOR XML PATH()函数应用

2018-01-23 23:26 567 查看

SELECT * FROM tbiz_ProjectRelation

目标统计每个项目有几条申请记录

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

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