请大家帮我看看下面这段代码是什么问题啊,这是空间商技术部给我发的,他说是这个代码导致网站网速慢的。我看不懂,谢谢
# Query_time: 16.469024 Lock_time: 0.000144 Rows_sent: 51 Rows_examined: 256
use muxlink_db;
SET timestamp=1242372668;
SELECT a.id, a.title, a.title_alias, a.introtext, a.fulltext, a.sectionid, a.state, a.catid, a.created, a.created_by, a.created_by_a
lias, a.modified, a.modified_by, a.checked_out, a.checked_out_time, a.publish_up, a.publish_down, a.attribs, a.hits, a.images, a.url
s, a.ordering, a.metakey, a.metadesc, a.access, CASE WHEN CHAR_LENGTH(a.alias) THEN CONCAT_WS(':', a.id, a.alias) ELSE a.id END as s
lug, CASE WHEN CHAR_LENGTH(cc.alias) THEN CONCAT_WS(":", cc.id, cc.alias) ELSE cc.id END as catslug, CHAR_LENGTH( a.`fulltext` ) AS
readmore, u.name AS author, u.usertype, cc.title AS category, g.name AS groups FROM jos_content AS a INNER JOIN jos_categories AS cc
ON cc.id = a.catid LEFT JOIN jos_sections AS s ON s.id = a.sectionid LEFT JOIN jos_users AS u ON u.id = a.created_by LEFT JOIN jos_
groups AS g ON a.access = g.id WHERE a.access <= 0 AND s.id = 7 AND s.access <= 0 AND cc.access <= 0 AND s.published = 1 AND cc.publ
ished = 1 AND a.state = 1 AND ( publish_up = '0000-00-00 00:00:00' OR publish_up <= '2009-05-15 07:30:45' ) AND ( publish_down = '00
00-00-00 00:00:00' OR publish_down >= '2009-05-15 07:30:45' ) ORDER BY a.created DESC;
~Wind 15:32:34
这一条查询语句花了16秒,所以打开Product那个页面极慢