Blocking Amis SQL (Super SQL SQL ??)

StackOverflow https://stackoverflow.com/questions/5056401

Question

Bonjour, j'ai des problèmes avec ce SQL.Fondamentalement, il affiche des statuts que mes amis ont affiché, et cela filtre les amis que j'ai bloqué.

Le SQL est SLOOOOOWWWWWWWW. Cela prend 2 secondes pour le traiter.Quel semble être le problème.(J'ai répertorié les tables et quelques exemples de la façon dont il a l'air sous le SQL) Merci d'avance! Le SQL .... 

SELECT from_user_id,content,wall.date, wall.wall_type, users.id, users.displayname 
            FROM wall

            INNER JOIN friendship ON ( wall.from_user_id =friendship.user_a OR wall.from_user_id = friendship.user_b ) 
            INNER JOIN users ON (wall.from_user_id = users.id)WHERE users.id not in (select blocked_id from blocklist where user_id = 1) and (wall.wall_type = 'home' OR wall.wall_type = 'profile' or wall.wall_type = 'topro') AND (
                  (friendship.user_a = 1 and friendship.user_b = wall.from_user_id)
                or  
                    (friendship.user_a = wall.from_user_id and friendship.user_b = 1)    or (wall.user_id_of_wall = 1 or type_id = 1 or from_user_id = 1))GROUP BY wall_id ORDER BY date DESC LIMIT 10

(Nom du tableau: Blocklist) 

    user_id | blocked_id
        1     74
        1     70
        1     94
        1     81

(Nom de la table: ami) 

user_a   user_b status  date
1        93         1   1297323354
1        79         1   1297323409
1        81         1   1297323403
1        82         1   1297323398
1        85         1   1297323389
1        90         1   1297323367
1        89         1   1297323373

(Nom du tableau: Utilisateurs) 

       id   displayname
        1   Kenny  Jack
        8   Wale Robinson
        7   Victor WIlliams
        6   Micheal Harris
        9   Micheal Boston
        10  Yestor Smith

La table murale 

wall_id wall_type   user_id_of_wall   type_id   from_user_id    content      viewed   date
   5    profile        8                    8          8         Just chilling! 0   1296858001

merci !!!

Était-ce utile?

La solution

NOT IN is used for fixed values, use NOT EXISTS instead :

SELECT from_user_id,content,wall.date, wall.wall_type, users.id, users.displayname 
            FROM wall

            INNER JOIN friendship ON ( wall.from_user_id =friendship.user_a OR wall.from_user_id = friendship.user_b ) 
            INNER JOIN users ON (wall.from_user_id = users.id)
WHERE not exists (select * from blocklist where users.id = blocked_id AND user_id = 1) and wall.wall_type IN ('home', 'profile', 'topro') AND (
                  (friendship.user_a = 1 and friendship.user_b = wall.from_user_id)
                or  
                    (friendship.user_a = wall.from_user_id and friendship.user_b = 1)    or (wall.user_id_of_wall = 1 or type_id = 1 or from_user_id = 1))
GROUP BY wall_id
ORDER BY date DESC LIMIT 10

[EDIT] Use IN for fixed values (wall_type)...

Autres conseils

always use WITH (NOLOCK) on read-only queries!

also, please remove all your paranthesis on your JOIN clause, did you copy and paste this from MS Access?

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