我需要一些帮助来优化查询。我有一个查询需要花费很长时间才能运行12s,如果我可以在优化它的时候获得一些帮助,我会非常喜欢,因为我不是sql专家。在这里它是:优化内部联接
SELECT ID ,
user_login ,
user_nicename ,
user_registered ,
user_status ,
display_name ,
t1.meta_value AS account_type ,
1 t2.meta_value AS views ,
GROUP_CONCAT(t4.term_id) AS interests_skills,
GROUP_CONCAT(t4.taxonomy) AS taxonomyComb ,
t4.term_id ,
t4.taxonomy
FROM wp_users
INNER JOIN wp_usermeta AS t1
ON (
t1.user_id = wp_users.ID
AND
(
t1.meta_key = 'account_type'
AND t1.meta_value = 'individual'
)
)
LEFT JOIN wp_usermeta AS t2
ON (
t2.user_id = wp_users.ID
AND t2.meta_key = 'views'
)
LEFT JOIN wp_term_relationships AS t3
ON (
t3.object_id = (1000000+wp_users.ID)
)
INNER JOIN wp_term_taxonomy AS t4
ON (
(
t3.term_taxonomy_id = t4.`term_taxonomy_id`
AND t4.taxonomy = 'category'
AND t4.term_id IN (396,410,411,416,142,417)
)
OR
(
t3.term_taxonomy_id = t4.`term_taxonomy_id`
AND t4.taxonomy = 'skill'
AND t4.term_id IN (461,463,464,466,490,468,470,491,473,474,475)
)
)
WHERE t4.term_id IS NOT NULL
GROUP BY ID LIMIT 0,10
这里是解释
1 SIMPLE T4范围PRIMARY,term_id_taxonomy,分类term_id_taxonomy 106 NULL 17使用其中;使用临时;使用文件排序
1 SIMPLE T1 REF USER_ID,meta_key meta_key 768常量3773使用其中
1个SIMPLE wp_users eq_ref PRIMARY PRIMARY 8 jasper_gi.t1.user_id 1
1 SIMPLE T2 REF USER_ID,meta_key meta_key 768常量2
1 SIMPLE T3 eq_ref PRIMARY,term_taxonomy_id PRIMARY 16 FUNC,jasper_gi.t4.term_taxonomy_id 1使用其中;使用索引
我修正了查询格式。查看编辑历史记录,如果您没有,我可能会无意中删除了一个句子!请检查并根据需要重新添加。 – 2010-12-08 14:16:14