1

返信とその返信に続いてコメントを返すクエリを考え出そうとしています。

何かのようなもの

comment 1
reply 1.1
reply 1.1.1
reply 1.2
comment 2
comment 3
comment 3.1

等

私はこれまでのところこれを持っています

SELECT [CommentID]
  ,[ParentID]
  ,[Message]
  , ROW_NUMBER() over(partition by ParentID order by CommentID ) as rn
  ,[CreatedBy]
  ,[CreatedDate]
  FROM [DBNAME].[dbo].[Commenttable] 
  GROUP BY [CommentID],[ParentID],[CreatedDate],[Message],[CreatedBy]

しかし、私が得るのは

comment 1
comment 2
comment 3
reply 1.1
reply 1.2
reply 3.1
reply 1.1.1

基本構造は、コメント ID、親 ID、およびメッセージを含む単なるテーブルです。コメントと返信は、私が達成しようとしていることを説明するのに役立ちます

4

1 に答える 1

3

これを試してください：

declare @CommentTable as Table ( CommentId Int Identity, ParentId Int Null, Message VarChar(16) )
insert into @CommentTable ( ParentId, Message ) values
  ( null, '1' ),
  ( null, '2' ), ( 1, '1.1' ),
  ( null, '3' ), ( 4, '3.1' ), ( 3, '1.1.1' ), ( 1, '1.2' )
select * from @CommentTable

; with Cindy as (
  -- Start with the base comments.
  select CommentId, ParentId, Message, Row_Number() over ( order by CommentId ) as Number,
    Cast( Row_Number() over ( order by CommentId ) as VarChar(1000) ) as Path,
    Cast( Right( '0000' + Cast( Row_Number() over ( order by CommentId ) as VarChar(4) ), 5 ) as VarChar(1000) ) as OrderPath
    from @CommentTable
    where ParentId is NULL
  union all
  -- Add replies on layer at a time.
  select CT.CommentId, CT.ParentId, CT.Message, Row_Number() over ( order by CT.CommentId ),
    Cast( C.Path + '.' + Cast( Row_Number() over ( order by CT.CommentId ) as VarChar(4) ) as VarChar(1000) ),
    Cast( C.OrderPath + Right( '0000' + Cast( Row_Number() over ( order by CT.CommentId ) as VarChar(4) ), 5 ) as VarChar(1000) )
    from @CommentTable as CT inner join
      Cindy as C on C.CommentId = CT.ParentId
  )
  select *
    from Cindy
    order by OrderPath
于 2012-04-09T17:57:51.030 に答える