需要帮助来构建一个codeigniter数据库查询[关闭]

Question

I want to make it using codeigniter query_builder function. Not getting Idea, please help.

$this->db->query("SELECT city as popularcity FROM(SELECT city,count(city) as
countcity FROM ads LIMIT 0, 6) as t ORDER BY MAX(countcity)");

Answer 1

$this->db->query("SELECT city as popularcity, countcity 
FROM 
(SELECT city, count(city) as countcity FROM ads GROUP BY city) as t
ORDER BY countcity DESC LIMIT 0, 6");