我的MySQL查询代码如下所示,并且该表中大约有数千条记录,到现在SQL在下面执行约5分钟或更长时间。我正在寻找对其进行优化的方法,以减少执行时间。谢谢!
SELECT `m`.`id`,
`m`.`id`,
`tr`.`name`,
`m`.`m_date`,
`t1`.`t_name` AS home,
`t2`.`t_name` AS away,
`m`.`score1`,
`m`.`score2`,
`cw1`.`tid` AS tid1,
`cw2`.`tid` AS tid2,
`o1`.`odds` AS odds1,
`o2`.`odds` AS odds2,
`m`.`m_time`
FROM `jos_bl_match` AS `m`
LEFT JOIN `jos_bl_matchday` AS `md` ON (`md`.`id` = `m`.`m_id`)
LEFT JOIN `jos_bl_seasons` AS `s` ON (`s`.`s_id` = `md`.`s_id`)
LEFT JOIN `jos_bl_tournament` AS `tr` ON (`tr`.`id` = `s`.`t_id`)
LEFT JOIN `jos_bl_teams` AS `t1` ON (`m`.`team1_id` = `t1`.`id`)
LEFT JOIN `jos_bl_teams` AS `t2` ON (`m`.`team2_id` = `t2`.`id`)
LEFT JOIN `jos_vuvuzelaodds_odds` AS `o1` ON (`o1`.`m_id` = `m`.`id`)
AND `o1`.`market_id` = 1
AND `o1`.`bookmaker_id` = 1
LEFT JOIN `jos_vuvuzelaodds_odds` AS `o2` ON (`o2`.`m_id` = `m`.`id`)
AND `o2`.`market_id` = 1
AND `o2`.`bookmaker_id` = 2
LEFT JOIN `jos_cwtags_tags` AS `cw1` ON (`cw1`.`item_id` = `o1`.`m_id`)
LEFT JOIN `jos_cwtags_tags` AS `cw2` ON (`cw2`.`item_id` = `o2`.`m_id`)
WHERE `m`.`published` = 1
AND `s`.`published` = '1'
AND `tr`.`published` = '1'
AND `s`.`s_id` = 869
AND `m`.`m_played` = '1'
AND `m`.`m_date` > 2013-01-01
AND `o1`.`odds` != ''
AND `o2`.`odds` != ''
AND `cw1`.`cat_id` = 19
AND `cw2`.`cat_id` = 21
ORDER BY `m`.`m_date`,
`md`.`id`,
`s`.`s_id`,
`tr`.`id` DESC LIMIT 0, 15
如果没有访问数据库的权限,这很难说。这似乎是很多数据,只能提取15条记录。您确定需要以这种方式提取数据吗?
最好的路线:
您没有从选择的季节表中选择任何字段。我使用了jos_bl_matchday表中的字段。
这应该可以帮助您入门。您还可以在选择语句中使用条件
(IF value = 1, table.field, null) as yadda
而不是一遍又一遍地联接一张桌子,但是您必须进行试验。
CREATE VIEW allTheGames AS SELECT
`m`.`id` as id,
`md`.`s_id` as seasonId,
`tr`.`name` as name,
`m`.`m_date` as m_date,
`t1`.`t_name` AS home,
`t2`.`t_name` AS away,
`m`.`score1` as score1,
`m`.`score2` as score2,
`cw1`.`tid` AS tid1,
`cw2`.`tid` AS tid2,
`o1`.`odds` AS odds1,
`o2`.`odds` AS odds2,
`m`.`m_time` as m_time
FROM `jos_bl_match` AS `m`
LEFT JOIN `jos_bl_matchday` AS `md` ON (`md`.`id` = `m`.`m_id`)
LEFT JOIN `jos_bl_tournament` AS `tr` ON (`tr`.`id` = `s`.`t_id`)
LEFT JOIN `jos_bl_teams` AS `t1` ON (`m`.`team1_id` = `t1`.`id`)
LEFT JOIN `jos_bl_teams` AS `t2` ON (`m`.`team2_id` = `t2`.`id`)
LEFT JOIN `jos_vuvuzelaodds_odds` AS `o1` ON (`o1`.`m_id` = `m`.`id`) AND `o1`.`market_id` = 1 AND `o1`.`bookmaker_id` = 1
LEFT JOIN `jos_vuvuzelaodds_odds` AS `o2` ON (`o2`.`m_id` = `m`.`id`) AND `o2`.`market_id` = 1 AND `o2`.`bookmaker_id` = 2
LEFT JOIN `jos_cwtags_tags` AS `cw1` ON (`cw1`.`item_id` = `o1`.`m_id`)
LEFT JOIN `jos_cwtags_tags` AS `cw2` ON (`cw2`.`item_id` = `o2`.`m_id`)
WHERE `m`.`published` = 1 AND `s`.`published` = '1' AND `tr`.`published` = '1'
AND `m`.`m_played` = '1'
AND `o1`.`odds1` != '' AND `o2`.`odds2` != ''
然后使用以下查询:
select * from allTheGames
WHERE season_id = 869 AND m_date > 2013-01-01 AND tid1 = 19 AND tid2 = 21
优化步骤:
准确找出您要从该查询中获取哪些数据,以及原因:这是自定义报告吗?一个网页?您是否需要一次拥有所有这些数据,还是让用户进行深入分析更有意义?查询多久运行一次?一分钟一次 一天一次?每个表中有几条记录?您的视图应反映此“游戏对象”
您的数据库:
您的表格结构:
祝你好运!
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