ReporterTbl与AttachmentTbl有一对多的关系.
在ReporterTbl中,我有一个ID(101),我可以使用AttachmentTbl多个与ReporterTbl.Id相关的附件
SELECT ISNULL(ReporterTbl.Id,0) AS Id,CONVERT(char(10),ReporterTbl.StartDate,101) AS StartDate,ISNULL(ReporterTbl.PriorityId,0) AS PriorityId,ISNULL(dbo.ReporterTbl.PriorityDesc,'') AS PriorityDesc,(select ReporterTbl.Id,COUNT(dbo.AttachmentTbl.Id) AS attachment_Id FROM dbo.AttachmentTbl RIGHT OUTER JOIN ReporterTbl ON dbo.AttachmentTbl.Id = ReporterTbl.Id GROUP BY ReporterTbl.Id) AS IsAttachment )
基本上,我想知道的是ReporterTbl.ID,我有多少个附件?
表结构:
ReporterTbl Id int {**PrimaryKey**} StartDate datetime PriorityId int PriorityDesc varchar(500 AttachmentTbl: AttachmentId indentity Id {**FK to ReproterTbl**} Filename Content ...
解决方法
select r.id,count(a.id) as Count from ReporterTbl r left outer join AttachmentTbl a on r.id = a.id group by r.id
版权声明:本文内容由互联网用户自发贡献,该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务,不拥有所有权,不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容, 请发送邮件至 dio@foxmail.com 举报,一经查实,本站将立刻删除。