Gauche Rejoignez plus vite ou interne Joindre plus vite?

Alors ... lequel est plus rapide (la valeur null n'est pas un problème) et sont indexés. XXX PRE>

Utilisation de jointures gauche: P>

Query (0.2693sec) :
    EXPLAIN EXTENDED SELECT * 
    FROM friend_events, zcms_users, user_events, 
    EVENTS WHERE friend_events.userid = '13006'
    AND friend_events.state =0
    AND UNIX_TIMESTAMP( friend_events.t ) >=1258923485
    AND friend_events.xid = user_events.id
    AND user_events.eid = events.eid
    AND events.active =1
    AND zcms_users.id = user_events.userid

EXPLAIN

    id select_type table type possible_keys key key_len ref rows Extra 
    1 SIMPLE zcms_users ALL PRIMARY NULL NULL NULL 43082 
    1 SIMPLE user_events ref PRIMARY,eid,userid userid 4 zcms_users.id 1 
    1 SIMPLE events eq_ref PRIMARY,active PRIMARY4 user_events.eid 1 Using where
    1 SIMPLE friend_events eq_ref PRIMARY PRIMARY 8 user_events.id,const 1 Using where



    LEFTJOIN QUERY: (0.0393 sec)

    EXPLAIN EXTENDED SELECT * 
    FROM `friend_events` 
    LEFT JOIN `user_events` ON user_events.id = friend_events.xid
    LEFT JOIN `events` ON user_events.eid = events.eid
    LEFT JOIN `zcms_users` ON user_events.userid = zcms_users.id
    WHERE (
    events.active =1
    )
    AND (
    friend_events.userid = '13006'
    )
    AND (
    friend_events.state =0
    )
    AND (
    UNIX_TIMESTAMP( friend_events.t ) >=1258923485
    )


EXPLAIN
    id select_type table type possible_keys key key_len ref rows Extra 
    1 SIMPLE friend_events ALL PRIMARY NULL NULL NULL 53113 Using where
    1 SIMPLE user_events eq_ref PRIMARY,eid PRIMARY 4 friend_events.xid 1 Using where
    1 SIMPLE zcms_users eq_ref PRIMARY PRIMARY 4 user_events.userid 1 
    1 SIMPLE events eq_ref PRIMARY,active PRIMARY 4 user_events.eid 1 Using where