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Comment émuler une jointure externe complète dans cette requête ?

Vous faites essentiellement une union de LEFT et RIGHT JOIN.

Vous avez en fait une ride intéressante dans la mesure où vous souhaitez également limiter les lignes à 3. Pour résoudre ce problème, vous devez

  • Limiter les sélections "gauche" et "droite" par 3
  • Utilisez ensuite le résultat de l'UNION dans une vue en ligne
  • puis Limiter à nouveau l'union par 3

MISE À JOUR Malheureusement, sauf erreur de ma part, vous ne pouvez pas le faire directement dans une UNION, vous devez donc ajouter une autre couche de vues en ligne avant l'UNION

Les LIMITES à l'intérieur de l'UNION offriront des avantages en termes de performances, puis la limite après vous donnera les résultats corrects.

SELECT title, 
   teaser, 
   nid, 
   DATE, 
   image, 
   image_tid 
FROM   (SELECT title, 
               teaser, 
               nid, 
               DATE, 
               image, 
               image_tid,
               created 
        FROM   (SELECT DISTINCT n.title, 
                                nr.teaser, 
                                n.nid, 
                                Date_format(From_unixtime(n.created), 
                                '%M %e, %Y') AS 
                                DATE, 
                                f.filepath 
                                AS 
                                image, 
                                tn_img.tid 
                                AS 
                                image_tid 
                                       , 
                                n.created 
                FROM   node n 
                       JOIN node_revisions nr 
                         ON n.nid = nr.nid 
                       LEFT JOIN content_field_related_images cfri 
                         ON ( n.nid = cfri.nid 
                              AND cfri.delta = 0 ) 
                       LEFT JOIN content_field_att_file cfaf 
                         ON cfri.field_related_images_nid = cfaf.nid 
                       LEFT JOIN files f 
                         ON cfaf.field_att_file_fid = f.fid 
                       JOIN term_node tn2 
                         ON n.nid = tn2.nid 
                       LEFT OUTER JOIN term_node tn_img 
                         ON cfri.field_related_images_nid = tn_img.nid 
                WHERE  n.status = 1 
                       AND n.TYPE = 'article' 
                       AND nr.body LIKE '%kimberly-clark%' 
                       AND tn2.tid = 143 
                ORDER  BY n.created DESC 
                LIMIT  3) tleft 
        UNION 
        SELECT title, 
               teaser, 
               nid, 
               DATE, 
               image, 
               image_tid,
               created  
        FROM   (SELECT DISTINCT n.title, 
                                nr.teaser, 
                                n.nid, 
                                Date_format(From_unixtime(n.created), 
                                '%M %e, %Y') AS 
                                DATE, 
                                f.filepath 
                                AS 
                                image, 
                                tn_img.tid 
                                AS 
                                image_tid 
                                       , 
                                n.created 
                FROM   node n 
                       JOIN node_revisions nr 
                         ON n.nid = nr.nid 
                       LEFT JOIN content_field_related_images cfri 
                         ON ( n.nid = cfri.nid 
                              AND cfri.delta = 0 ) 
                       LEFT JOIN content_field_att_file cfaf 
                         ON cfri.field_related_images_nid = cfaf.nid 
                       LEFT JOIN files f 
                         ON cfaf.field_att_file_fid = f.fid 
                       JOIN term_node tn2 
                         ON n.nid = tn2.nid 
                       RIGHT OUTER JOIN term_node tn_img 
                         ON cfri.field_related_images_nid = tn_img.nid 
                WHERE  n.status = 1 
                       AND n.TYPE = 'article' 
                       AND nr.body LIKE '%kimberly-clark%' 
                       AND tn2.tid = 143 
                ORDER  BY n.created DESC 
                LIMIT  3) tright) t 
ORDER  BY created DESC 
LIMIT  3 

MISE À JOUR En utilisant les suggestions spencer7593 et ​​ypercube, voici une approche alternative utilisant deux instructions UNION ALL et aucune vue en ligne.

SELECT DISTINCT n.created, 
                n.title, 
                nr.teaser, 
                n.nid, 
                Date_format(From_unixtime(n.created), '%M %e, %Y') AS DATE, 
                f.filepath                                         AS image, 
                tn_img.tid                                         AS image_tid 
FROM   node n 
       JOIN node_revisions nr 
         ON n.nid = nr.nid 
       LEFT JOIN content_field_related_images cfri 
         ON ( n.nid = cfri.nid 
              AND cfri.delta = 0 ) 
       LEFT JOIN content_field_att_file cfaf 
         ON cfri.field_related_images_nid = cfaf.nid 
       LEFT JOIN files f 
         ON cfaf.field_att_file_fid = f.fid 
       JOIN term_node tn2 
         ON n.nid = tn2.nid 
       LEFT OUTER JOIN term_node tn_img 
         ON cfri.field_related_images_nid = tn_img.nid 
WHERE  n.status = 1 
       AND n.TYPE = 'article' 
       AND nr.body LIKE '%kimberly-clark%' 
       AND tn2.tid = 143 

UNION ALL 
SELECT DISTINCT n.created, 
                n.title, 
                nr.teaser, 
                n.nid, 
                Date_format(From_unixtime(n.created), '%M %e, %Y') AS DATE, 
                f.filepath                                         AS image, 
                tn_img.tid                                         AS image_tid 
FROM   node n 
       JOIN node_revisions nr 
         ON n.nid = nr.nid 
       LEFT JOIN content_field_related_images cfri 
         ON ( n.nid = cfri.nid 
              AND cfri.delta = 0 ) 
       LEFT JOIN content_field_att_file cfaf 
         ON cfri.field_related_images_nid = cfaf.nid 
       LEFT JOIN files f 
         ON cfaf.field_att_file_fid = f.fid 
       JOIN term_node tn2 
         ON n.nid = tn2.nid 
       RIGHT JOIN term_node tn_img 
         ON cfri.field_related_images_nid = tn_img.nid 
WHERE  n.status = 1 
       AND n.TYPE = 'article' 
       AND nr.body LIKE '%kimberly-clark%' 
       AND tn2.tid = 143 
       AND cfri.field_related_images_nid IS NULL 
ORDER  BY 1 DESC 
LIMIT 
3