MYSQL-按索引列排序

Question

我有這張有500,000行的桌子

CREATE TABLE IF NOT EXISTS `listings` (
  `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `source_id` int(10) unsigned NOT NULL,
  `cat_id` mediumint(5) NOT NULL,
  `title` mediumtext NOT NULL,
  `views_point` int(10) unsigned NOT NULL DEFAULT '0',
  `publishedon_hourly` int(10) unsigned NOT NULL DEFAULT '0',
  PRIMARY KEY (`id`),
  KEY `views_point` (`views_point`),
  KEY `listings` (`publishedon_hourly`,`published`,`cat_id`,`source_id`)
) ENGINE=MyISAM  DEFAULT CHARSET=utf8 ROW_FORMAT=FIXED AUTO_INCREMENT=365513 ;

我想這樣查詢

SELECT *
FROM listings
WHERE (
`publishedon_hourly`
BETWEEN UNIX_TIMESTAMP( '2015-09-5 12:00:00' )AND UNIX_TIMESTAMP( '2015-10-5 12:00:00' ) ) AND ( published =1 ) AND cat_id
IN ( 1, 2, 3, 4, 5 )
ORDER BY views_point DESC
LIMIT 10 

這個查詢有些時間可以按照我想要的工作（ 見此 ），但是經過一些意見，這是不正確的，我在網上搜索了解決方案，發現了

這個： http : //venublog.com/2007/11/29/mysql-how-to-avoid-filesort/和這個： http : //www.getsymphony.com/discuss/issues/view/657/和我添加在views_point上views_point然后嘗試此查詢

select t1.* 
from  listings t1 
left outer join  listings t2 on (t1.views_point=t2.views_point) 
order by t1.views_point 
limit 10

這是解釋

但我不能添加此條件

`publishedon_hourly` BETWEEN UNIX_TIMESTAMP( '2015-09-5 12:00:00' ) AND UNIX_TIMESTAMP( '2015-09-5 12:00:00' ) ) AND ( published =1 ) AND cat_id = 5

我不知道我應該分配給哪個（t1或t2）？

在另一方面呢

SELECT *
FROM listings
WHERE (
`publishedon_hourly` BETWEEN UNIX_TIMESTAMP( '2015-09-5 00:00:00' ) AND UNIX_TIMESTAMP( '2015-09-5 23:00:00' ))
AND (published =1)
and views_point is not null
ORDER BY views_point DESC limit 20

如果有人不好，請問大博客如何通過點擊獲得帖子？

Answer 1

您應該將listings索引拆分為單獨的索引。

除此之外，假設您按t1排序，幾乎可以肯定的是，對於所有條件都應指定t1 。

編輯：使用條件為

`t1`.`publishedon_hourly` BETWEEN UNIX_TIMESTAMP( '2015-09-5 12:00:00' ) AND UNIX_TIMESTAMP( '2015-09-5 12:00:00' ) ) AND ( `t1`.`published` = 1 ) AND `t1`.`cat_id` = 5