problème avec les doublons dans un JOIN SQL

Question

j'ai le jeu de résultats suivant d'une jointure de trois tables, un articles tableau, une table des produits, un articles aux produits de la table de correspondance.

Je souhaite que les résultats avec des doublons soient supprimés de la même manière qu'un identifiant de contenu distinct.

jeu de résultats actuel:

[ContendId] [Title]   [productId] 
1   article one  2 
1   article one  3 
1   article one  9 
4   article four  1 
4   article four  10 
4   article four  14 
5   article five  1 
6   article six  8 
6   article six  10 
6   article six  11 
6   article six  13 
7   article seven 14 

Résultat souhaité jeu:

[ContendId] [Title]   [productId] 
1   article one  * 
4   article four  * 
5   article five  * 
6   article six  * 
7   article seven * 

Voici exemple condensé de SQL pertinente:

IF EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'tempdb.dbo.products') AND type = (N'U')) 
drop table tempdb.dbo.products 
go 
CREATE TABLE tempdb.dbo.products ( 
productid int, 
productname varchar(255) 
) 

go 

IF EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'articles') AND type = (N'U')) 
drop table tempdb.dbo.articles 
go 
create table tempdb.dbo.articles (
contentid int, 
title varchar(255) 
) 

IF EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'articles') AND type = (N'U')) 
drop table tempdb.dbo.articles 
go 
create table tempdb.dbo.articles (
contentid int, 
title varchar(255) 
) 


IF EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'articleproducts') AND type = (N'U')) 
drop table tempdb.dbo.articleproducts 
go 
create table tempdb.dbo.articleproducts (
contentid int, 
productid int 
) 


insert into tempdb.dbo.products values (1,'product one'), 
             (2,'product two'), 
             (3,'product three'), 
             (4,'product four'), 
             (5,'product five'), 
             (6,'product six'), 
             (7,'product seven'), 
             (8,'product eigth'), 
             (9,'product nine'), 
             (10,'product ten'), 
             (11,'product eleven'), 
             (12,'product twelve'), 
             (13,'product thirteen'), 
             (14,'product fourteen') 

insert into tempdb.dbo.articles VALUES (1,'article one'), 
             (2, 'article two'), 
             (3, 'article three'), 
             (4, 'article four'), 
             (5, 'article five'), 
             (6, 'article six'), 
             (7, 'article seven'), 
             (8, 'article eight'), 
             (9, 'article nine'), 
             (10, 'article ten') 


INSERT INTO tempdb.dbo.articleproducts VALUES (1,2), 
               (1,3), 
               (1,9), 
               (4,1), 
               (4,10), 
               (4,14), 
               (5,1), 
               (6,8), 
               (6,10), 
               (6,11), 
               (6,13), 
               (7,14) 

GO 


select DISTINCT(a.contentid), a.title, p.productid from articles a 
     JOIN articleproducts ap ON a.contentid = ap.contentid 
     JOIN products p ON a.contentid = ap.contentid AND p.productid = ap.productid 

     ORDER BY a.contentid 

Answer 1

Votre question doit manquer quelque chose ...

SELECT DISTINCT a.* 
FROM articles AS a 
INNER JOIN articleproducts AS ap 
    ON a.contentid = ap.contentid 
ORDER BY a.contentid 

Answer 2

Juste figured it out. Il me fallait une bonne Group By clause

select a.contentid, a.title, count (*) d'articles JOIN articleproducts ap SUR a.contentid = ap.contentid REJOIGNEZ produits p ON a.contentid = ap.contentid ET p.productid = Groupe ap.productid par a.contentid, ORDER a.title pAR a.contentid

Answer 3

SELECT DISTINCT(a.contentid), a.title, p.productid 
    FROM articles a 
    INNER JOIN articleproducts ap 
     ON a.contentid = ap.contentid 
    INEER JOIN products p 
     ON a.contentid = ap.contentid 
     AND p.productid = ap.productid 
    GROUP BY (a.contentid), a.title 
    ORDER BY a.contentid 

Cela devrait fonctionner!