我想从多个表中拉出数据,当我用ORDER BY一个日期时间字段它会在至少10秒后返回结果,但如果我做同样的查询没有ORDER BY那么它返回2秒以内的结果。ORDER BY datetime使查询非常缓慢
这是我的当前查询
SELECT
ph.call_subject AS callSubject,
ac.account_name AS accountName,
DATE_FORMAT(ph.trigger_on, "%c/%e/%Y %h:%i %p") AS triggerOn,
ind.name AS industry,
cc.call_code_name AS callCode
FROM phone_calls AS ph
INNER JOIN accounts AS ac ON ph.account_id = ac.account_id
INNER JOIN industries AS ind ON ind.industry_id = ac.industry_id
INNER JOIN call_codes AS cc ON ph.call_code_id = cc.call_code_id
WHERE ac.status = 1 AND ph.status = 1 AND ph.owner_id = 1 AND ac.do_not_call = 0
AND ph.trigger_on BETWEEN '2012-11-19 00:00:00' AND '2013-03-19 23:59:59'
ORDER BY ph.trigger_on ASC LIMIT 0,1000
下列字段是所有类型INT(11)UNSIGNED
ph.account_id
ac.account_id
ind.industry_id
ac.industry_id
ph.call_code_id
cc.call_code_id
ph.owner_id
以下字段的全部类型TINYINT(1)
ac.status
ph.status
ac.do_not_call
该字段是日期时间类型
ph.trigger_on
请注意,有帐户300K记录和phone_calls有500万条记录。 我能做些什么来使ORDER BY更快?请注意,我所有的where子句字段,我所有的ON子句和ph.trigger_on都被编入索引。我使用InnoDB存储引擎而不是MyIsam。
感谢
请包括表定义,所以我们可以看到您选择什么类型和到位 – 2013-03-20 00:06:03
请检查我的职务索引再次为我的一些字段类型更新它 – Jaylen 2013-03-20 00:15:19
请你告诉我们解释什么回报? – redmoon7777 2013-03-20 04:51:23