関数/プロシージャ内の節付きのSQL Server 2014

Question

"with"句を使用してユーザー定義の関数/ユーザー定義プロシージャを作成することは可能ですか？

CREATE FUNCTION udf_UsersComments (
    @Id INT 
    ) 
RETURNS @UsersComments TABLE (
    CommentTextFormatted NVARCHAR(MAX), 
    DateCommented NVARCHAR(MAX), 
    Username NVARCHAR(255), 
    ParentCommentId INT, 
    Id INT 
    ) 
AS 
BEGIN 
WITH UpperHierarchy (Id, QuestionId, CommentText, ParentCommentId, DateCommented, UserId, HierarchyOrder, 
    lineage) 
    AS (SELECT com.Id, 
       com.QuestionId, 
       com.CommentText, 
       com.ParentCommentId, 
       com.DateCommented, 
       com.UserId, 
       0       AS HierarchyOrder, 
       Cast ('/' AS VARCHAR(255)) AS Lineage 
     FROM Comments AS com 
     WHERE com.ParentCommentId IS NULL AND IsDeleted=0 
     UNION ALL 
     (SELECT com.Id, 
       com.QuestionId, 
       com.CommentText, 
       com.ParentCommentId, 
       com.DateCommented, 
       com.UserId, 
       HierarchyOrder + 1, 
       Cast(lineage + Ltrim(Str(com.ParentCommentId, 6, 0)) 
        + '/' AS VARCHAR(255)) 
     FROM Comments AS com 
       INNER JOIN UpperHierarchy AS parent 
         ON com.ParentCommentId = parent.Id 
         WHERE com.IsDeleted=0)) 

SELECT CommentTextFormatted, DateCommented, U.Username, ParentCommentId, Com.id 
FROM Questions AS Q 
INNER JOIN 
    (SELECT Space(HierarchyOrder*5) + CommentText AS CommentTextFormatted, Id, QuestionId, ParentCommentId, DateCommented, UserId, lineage 
    FROM UpperHierarchy) AS Com 
ON Com.QuestionId=Q.Id 
INNER JOIN Users AS U 
ON U.Id=Com.UserId 
WHERE Q.Id=@Id 
ORDER BY lineage + Ltrim(Str(Q.Id, 6, 0)) 
RETURN 
END 
GO 

そして私は、このエラー

メッセージ444、レベル16、状態2、プロシージャudf_UsersComments、ライン クライアントにデータを返すことができない機能に含まれる13個の Select文を取得しています。

Answer 1

インラインテーブル値関数として作成します。私が代わりに、複数行のテーブル値関数

CREATE FUNCTION udf_UsersComments (
    @Id INT 
    ) 
RETURNS TABLE 
AS 
Return(
WITH UpperHierarchy (Id, QuestionId, CommentText, ParentCommentId, DateCommented, UserId, HierarchyOrder, 
    lineage) 
    AS (SELECT com.Id, 
       com.QuestionId, 
       com.CommentText, 
       com.ParentCommentId, 
       com.DateCommented, 
       com.UserId, 
       0       AS HierarchyOrder, 
       Cast ('/' AS VARCHAR(255)) AS Lineage 
     FROM Comments AS com 
     WHERE com.ParentCommentId IS NULL AND IsDeleted=0 
     UNION ALL 
     (SELECT com.Id, 
       com.QuestionId, 
       com.CommentText, 
       com.ParentCommentId, 
       com.DateCommented, 
       com.UserId, 
       HierarchyOrder + 1, 
       Cast(lineage + Ltrim(Str(com.ParentCommentId, 6, 0)) 
        + '/' AS VARCHAR(255)) 
     FROM Comments AS com 
       INNER JOIN UpperHierarchy AS parent 
         ON com.ParentCommentId = parent.Id 
         WHERE com.IsDeleted=0)) 

SELECT CommentTextFormatted, DateCommented, U.Username, ParentCommentId, Com.id,ordercol = lineage + Ltrim(Str(Q.Id, 6, 0)) 
FROM Questions AS Q 
INNER JOIN 
    (SELECT Space(HierarchyOrder*5) + CommentText AS CommentTextFormatted, Id, QuestionId, ParentCommentId, DateCommented, UserId, lineage 
    FROM UpperHierarchy) AS Com 
ON Com.QuestionId=Q.Id 
INNER JOIN Users AS U 
ON U.Id=Com.UserId 
WHERE Q.Id=@Id) 

ノートのインライン選んだ理由を知るために、このquestionをチェックし、私は、機能を選択しながら発注を行うために、結果に別の列を追加しました。あなたは、元の問題について

関数内 TOPなし

select CommentTextFormatted, DateCommented, Username, ParentCommentId, id 
from udf_UsersComments(1)--some id 
order by ordercol 

をOrder byを使用することはできません、あなたはinsert into @UsersCommentsが欠落しています。 CTE selectは、レコードを@UsersCommentsに挿入する必要があります。