Question

我有以下SQL表：

create table dbo.Media ( 
  Id int identity not null
    constraint PK_Media_Id primary key clustered (Id),
  Created datetime not null,
)

create table dbo.MediaFile (
  MediaId int not null, 
  FileId int not null
)    

create table dbo.[File]
(
  Id int identity not null
    constraint PK_File_Id primary key clustered (Id),
  Content varbinary (max) filestream null
    constraint DF_File_Content default (0x)
) filestream_on [FILE]

alter table dbo.MediaFile
add constraint FK_MediaFile_MediaId foreign key (MediaId) references [Media](Id) on delete cascade on update cascade,
    constraint FK_MediaFile_FileId foreign key (FileId) references [File](Id) on delete cascade on update cascade;

我需要删除创建日期超过2个月的所有媒体行以及对应的MediaFile和文件行......所以我有：

DELETE 
FROM dbo.Media
WHERE Created < GETDATE() - 60

我的问题是如何确保删除所有MediaFile和文件记录。

Answer 1

delete [File] 
join MediaFile 
  on [File].Id = MediaFile.FileId 
join Media 
  on Media.ID = MediaFile.MediaId 
 and Media.Created < GETDATE() - 60

delete MediaFile 
join Media 
  on Media.ID = MediaFile.MediaId 
 and Media.Created < GETDATE() - 60

删除子表中的所有文件

1 个答案: