如何优化这个没有关键字和ips重复的mysql查询？

Question

SELECT 
COUNT(keywords) AS count_keywords 
FROM (
    SELECT * FROM keyword_searches GROUP BY keywords, ip 
) tmp_table 
WHERE created_at BETWEEN '2012-03-31 00:00:00' AND '2015-03-31 23:59:59'; 

如何优化此查询？

Answer 1

首先在内部查询中使用where条件筛选记录，然后在外部查询中计数keywords。

SELECT 
COUNT(keywords) AS count_keywords 
FROM (
    SELECT * FROM keyword_searches WHERE created_at BETWEEN '2012-03-31 00:00:00' AND '2015-03-31 23:59:59' GROUP BY keywords, ip 
) tmp_table ; 

你的情况，你有未满足条件BETWEEN '2012-03-31 00:00:00' AND '2015-03-31 23:59:59'