Valeurs SQL GROUP BY et NULL: comment regrouper mes résultats uniquement par des valeurs non nulles?

Question

Ma requête:

SELECT *, 
    contacts.createdAt AS contactcreatedAt, 
    contacts.updatedAt AS contactupdatedAt, 
    bidresponses.itemid AS bidresponseitemid, 
    bidresponses.personid AS bidresponsepersonid, 
    SUM(tagsitems.quantity) AS totalquantity 
FROM items 
LEFT OUTER JOIN tagsitems ON items.id = tagsitems.itemid 
LEFT OUTER JOIN itemscontacts ON items.id = itemscontacts.itemid 
LEFT OUTER JOIN contacts ON itemscontacts.contactid = contacts.id 
LEFT OUTER JOIN bidresponses ON items.id = bidresponses.itemid AND itemscontacts.personid = bidresponses.personid 
LEFT OUTER JOIN bidtemplatefields ON bidresponses.bidtemplatefieldid = bidtemplatefields.id 
WHERE ((items.id = 70687 OR items.id = 70595) AND itemscontacts.relationship = 's') AND (items.deletedAt IS NULL) 
GROUP BY items.id, tagsitems.itemid, bidresponses.personid, bidresponses.bidtemplatefieldid 
ORDER BY items.id ASC 

Sans les SOMME() et GROUP BY clauses de cette requête renvoie les résultats souhaités, moins la valeur importante TotalQuantity.

La tâche qui m'a bloqué pour le moment est la construction de la clause GROUP BY afin qu'elle "ignore" les valeurs NULL ou manquantes des réponses aux enchères. Les données sont telles que les résultats seront un ensemble mixte d'éléments - certains ont des entrées dans la table de réponses aux réponses et d'autres non.

EDIT: Je souhaite que les entrées avec des valeurs NULL dans la table de réponses aux demandes s'affichent. Avec la clause GROUP BY actuelle, ils ne le sont pas. Je devrais noter que la seule raison pour laquelle j'utilise le regroupement est que je peux obtenir la valeur de quantité totale. Voici un exemple de la sortie de requête sans SUM() et les clauses GROUP BY:

+-------+------------+------+---------------------------+------+------------+-----------+-----------+---------------------+---------------------+-----------+----------+-------+--------+----------+--------+-----------+----------+---------------------+--------------+---------------+--------------+-----------+------------+------+-----------+----------+----------------+-----------------+---------------------+---------------------+-----------+----------+---------------------+---------------------+--------------------+--------+-------------+----------+------+------------------+-------------+---------------------+---------------------+-------------------+---------------------+ 
| id | itemtypeid | code | description    | cost | unittypeid | projectid | companyid | createdAt   | updatedAt   | deletedAt | unittype | tagid | itemid | quantity | itemid | contactid | personid | sentdate   | responsedate | bidtemplateid | relationship | awarddate | assigndate | id | companyid | personid | companyidOwner | parentContactid | createdAt   | updatedAt   | firstName | lastName | company    | email    | bidtemplatefieldid | itemid | bidresponse | personid | id | bidtemplatefield | fieldtypeid | contactcreatedAt | contactupdatedAt | bidresponseitemid | bidresponsepersonid | 
+-------+------------+------+---------------------------+------+------------+-----------+-----------+---------------------+---------------------+-----------+----------+-------+--------+----------+--------+-----------+----------+---------------------+--------------+---------------+--------------+-----------+------------+------+-----------+----------+----------------+-----------------+---------------------+---------------------+-----------+----------+---------------------+---------------------+--------------------+--------+-------------+----------+------+------------------+-------------+---------------------+---------------------+-------------------+---------------------+ 
| 70595 |   1 | NULL | HD Banners    | NULL |  NULL |   7 |   1 | 2010-05-10 17:00:11 | 2010-08-14 18:57:41 | NULL  | each  | NULL | NULL |  NULL | 70595 |  16 | 34789 | 2010-08-14 22:37:01 |   NULL |    1 | s   |  NULL |  NULL | 16 |  NULL |  NULL |    1 |   NULL | 2010-08-05 18:40:01 | 2010-08-05 18:41:40 | NULL  | NULL  | sdf     | 23523@wokd.com  |    NULL | NULL | NULL  |  NULL | NULL | NULL    |  NULL | 2010-08-05 18:40:01 | 2010-08-05 18:41:40 |    NULL |    NULL | 
| 70595 |   1 | NULL | HD Banners    | NULL |  NULL |   7 |   1 | 2010-05-10 17:00:11 | 2010-08-14 18:57:41 | NULL  | each  | NULL | NULL |  NULL | 70595 |  22 | 34794 | 2010-08-14 18:44:02 |   NULL |    1 | s   |  NULL |  NULL | 22 |  NULL | 34794 |    1 |   NULL | 2010-08-09 19:56:28 | 2010-08-10 13:55:03 | NULL  | NULL  | anewwwww   | hmm@hmm.com   |    NULL | NULL | NULL  |  NULL | NULL | NULL    |  NULL | 2010-08-09 19:56:28 | 2010-08-10 13:55:03 |    NULL |    NULL | 
| 70595 |   1 | NULL | HD Banners    | NULL |  NULL |   7 |   1 | 2010-05-10 17:00:11 | 2010-08-14 18:57:41 | NULL  | each  | NULL | NULL |  NULL | 70595 |  27 | 34797 | 2010-08-14 22:36:59 |   NULL |    1 | s   |  NULL |  NULL | 27 |  NULL |  NULL |    1 |   NULL | 2010-08-10 19:11:52 | NULL    | NULL  | NULL  | 3k3jdjhgj@wrwer.com | 3k3jdjhgj@wrwer.com |    NULL | NULL | NULL  |  NULL | NULL | NULL    |  NULL | 2010-08-10 19:11:52 | NULL    |    NULL |    NULL | 
| 70595 |   1 | NULL | HD Banners    | NULL |  NULL |   7 |   1 | 2010-05-10 17:00:11 | 2010-08-14 18:57:41 | NULL  | each  | NULL | NULL |  NULL | 70595 |  28 | 34798 | 2010-08-14 22:37:00 |   NULL |    1 | s   |  NULL |  NULL | 28 |  NULL |  NULL |    1 |   NULL | 2010-08-10 19:18:27 | NULL    | NULL  | NULL  | 3838474@234234.com | 3838474@234234.com |    NULL | NULL | NULL  |  NULL | NULL | NULL    |  NULL | 2010-08-10 19:18:27 | NULL    |    NULL |    NULL | 
| 70687 |   1 | NULL | Editing and adding labels | NULL |  NULL |   7 |   1 | 2010-05-15 07:26:33 | 2010-08-14 18:55:48 | NULL  | each  | 12 | 70687 |  NULL | 70687 |  16 | 34789 | 2010-08-14 22:37:01 |   NULL |    1 | s   |  NULL |  NULL | 16 |  NULL |  NULL |    1 |   NULL | 2010-08-05 18:40:01 | 2010-08-05 18:41:40 | NULL  | NULL  | sdf     | 23523@wokd.com  |    NULL | NULL | NULL  |  NULL | NULL | NULL    |  NULL | 2010-08-05 18:40:01 | 2010-08-05 18:41:40 |    NULL |    NULL | 
| 70687 |   1 | NULL | Editing and adding labels | NULL |  NULL |   7 |   1 | 2010-05-15 07:26:33 | 2010-08-14 18:55:48 | NULL  | each  |  2 | 70687 |  NULL | 70687 |  16 | 34789 | 2010-08-14 22:37:01 |   NULL |    1 | s   |  NULL |  NULL | 16 |  NULL |  NULL |    1 |   NULL | 2010-08-05 18:40:01 | 2010-08-05 18:41:40 | NULL  | NULL  | sdf     | 23523@wokd.com  |    NULL | NULL | NULL  |  NULL | NULL | NULL    |  NULL | 2010-08-05 18:40:01 | 2010-08-05 18:41:40 |    NULL |    NULL | 
| 70687 |   1 | NULL | Editing and adding labels | NULL |  NULL |   7 |   1 | 2010-05-15 07:26:33 | 2010-08-14 18:55:48 | NULL  | each  | 12 | 70687 |  NULL | 70687 |  27 | 34797 | 2010-08-14 22:36:59 |   NULL |    1 | s   |  NULL |  NULL | 27 |  NULL |  NULL |    1 |   NULL | 2010-08-10 19:11:52 | NULL    | NULL  | NULL  | 3k3jdjhgj@wrwer.com | 3k3jdjhgj@wrwer.com |    NULL | NULL | NULL  |  NULL | NULL | NULL    |  NULL | 2010-08-10 19:11:52 | NULL    |    NULL |    NULL | 
| 70687 |   1 | NULL | Editing and adding labels | NULL |  NULL |   7 |   1 | 2010-05-15 07:26:33 | 2010-08-14 18:55:48 | NULL  | each  |  2 | 70687 |  NULL | 70687 |  27 | 34797 | 2010-08-14 22:36:59 |   NULL |    1 | s   |  NULL |  NULL | 27 |  NULL |  NULL |    1 |   NULL | 2010-08-10 19:11:52 | NULL    | NULL  | NULL  | 3k3jdjhgj@wrwer.com | 3k3jdjhgj@wrwer.com |    NULL | NULL | NULL  |  NULL | NULL | NULL    |  NULL | 2010-08-10 19:11:52 | NULL    |    NULL |    NULL | 
| 70687 |   1 | NULL | Editing and adding labels | NULL |  NULL |   7 |   1 | 2010-05-15 07:26:33 | 2010-08-14 18:55:48 | NULL  | each  | 12 | 70687 |  NULL | 70687 |  28 | 34798 | 2010-08-14 22:37:00 |   NULL |    1 | s   |  NULL |  NULL | 28 |  NULL |  NULL |    1 |   NULL | 2010-08-10 19:18:27 | NULL    | NULL  | NULL  | 3838474@234234.com | 3838474@234234.com |    NULL | NULL | NULL  |  NULL | NULL | NULL    |  NULL | 2010-08-10 19:18:27 | NULL    |    NULL |    NULL | 
| 70687 |   1 | NULL | Editing and adding labels | NULL |  NULL |   7 |   1 | 2010-05-15 07:26:33 | 2010-08-14 18:55:48 | NULL  | each  |  2 | 70687 |  NULL | 70687 |  28 | 34798 | 2010-08-14 22:37:00 |   NULL |    1 | s   |  NULL |  NULL | 28 |  NULL |  NULL |    1 |   NULL | 2010-08-10 19:18:27 | NULL    | NULL  | NULL  | 3838474@234234.com | 3838474@234234.com |    NULL | NULL | NULL  |  NULL | NULL | NULL    |  NULL | 2010-08-10 19:18:27 | NULL    |    NULL |    NULL | 
+-------+------------+------+---------------------------+------+------------+-----------+-----------+---------------------+---------------------+-----------+----------+-------+--------+----------+--------+-----------+----------+---------------------+--------------+---------------+--------------+-----------+------------+------+-----------+----------+----------------+-----------------+---------------------+---------------------+-----------+----------+---------------------+---------------------+--------------------+--------+-------------+----------+------+------------------+-------------+---------------------+---------------------+-------------------+---------------------+ 

Voici un exemple de la sortie de la requête avec SUM() et les clauses GROUP BY:

+-------+------------+------+---------------------------+------+------------+-----------+-----------+---------------------+---------------------+-----------+----------+-------+--------+----------+--------+-----------+----------+---------------------+--------------+---------------+--------------+-----------+------------+------+-----------+----------+----------------+-----------------+---------------------+---------------------+-----------+----------+---------+----------------+--------------------+--------+-------------+----------+------+------------------+-------------+---------------------+---------------------+-------------------+---------------------+---------------+ 
| id | itemtypeid | code | description    | cost | unittypeid | projectid | companyid | createdAt   | updatedAt   | deletedAt | unittype | tagid | itemid | quantity | itemid | contactid | personid | sentdate   | responsedate | bidtemplateid | relationship | awarddate | assigndate | id | companyid | personid | companyidOwner | parentContactid | createdAt   | updatedAt   | firstName | lastName | company | email   | bidtemplatefieldid | itemid | bidresponse | personid | id | bidtemplatefield | fieldtypeid | contactcreatedAt | contactupdatedAt | bidresponseitemid | bidresponsepersonid | totalquantity | 
+-------+------------+------+---------------------------+------+------------+-----------+-----------+---------------------+---------------------+-----------+----------+-------+--------+----------+--------+-----------+----------+---------------------+--------------+---------------+--------------+-----------+------------+------+-----------+----------+----------------+-----------------+---------------------+---------------------+-----------+----------+---------+----------------+--------------------+--------+-------------+----------+------+------------------+-------------+---------------------+---------------------+-------------------+---------------------+---------------+ 
| 70595 |   1 | NULL | HD Banners    | NULL |  NULL |   7 |   1 | 2010-05-10 17:00:11 | 2010-08-14 18:57:41 | NULL  | each  | NULL | NULL |  NULL | 70595 |  16 | 34789 | 2010-08-14 22:37:01 |   NULL |    1 | s   |  NULL |  NULL | 16 |  NULL |  NULL |    1 |   NULL | 2010-08-05 18:40:01 | 2010-08-05 18:41:40 | NULL  | NULL  | sdf  | 23523@wokd.com |    NULL | NULL | NULL  |  NULL | NULL | NULL    |  NULL | 2010-08-05 18:40:01 | 2010-08-05 18:41:40 |    NULL |    NULL |   NULL | 
| 70687 |   1 | NULL | Editing and adding labels | NULL |  NULL |   7 |   1 | 2010-05-15 07:26:33 | 2010-08-14 18:55:48 | NULL  | each  | 12 | 70687 |  NULL | 70687 |  16 | 34789 | 2010-08-14 22:37:01 |   NULL |    1 | s   |  NULL |  NULL | 16 |  NULL |  NULL |    1 |   NULL | 2010-08-05 18:40:01 | 2010-08-05 18:41:40 | NULL  | NULL  | sdf  | 23523@wokd.com |    NULL | NULL | NULL  |  NULL | NULL | NULL    |  NULL | 2010-08-05 18:40:01 | 2010-08-05 18:41:40 |    NULL |    NULL |   NULL | 
+-------+------------+------+---------------------------+------+------------+-----------+-----------+---------------------+---------------------+-----------+----------+-------+--------+----------+--------+-----------+----------+---------------------+--------------+---------------+--------------+-----------+------------+------+-----------+----------+----------------+-----------------+---------------------+---------------------+-----------+----------+---------+----------------+--------------------+--------+-------------+----------+------+------------------+-------------+---------------------+---------------------+-------------------+---------------------+---------------+ 

Answer 1

Vous devez inclure toutes les colonnes significatives non agrégées dans votre clause GROUP BY. En ce moment, vous ne groupez pas par createdAt etc.

Answer 2

Si vous avez besoin de toutes ces lignes SUM() et que le GROUP BY requis ne sera pas une bonne solution.

La meilleure solution sera probablement d'ajouter simplement les quantités lors du traitement/de la boucle à travers toutes les lignes de votre code client/script.

Sinon, vous pouvez interroger deux fois, une fois avec GROUP BY et SUM() pour obtenir la quantité pour chaque items.id mais même faire une boucle supplémentaire à travers toutes les lignes de votre code client sera probablement plus rapide que l'interrogation deux fois, pourrait aussi dépendre de la taille du résultat.