Question

I was thinking a way to using one query with a subquery instead of using two seperate queries.

But turns out using a subquery is causing multiple requests for each row in result set. Is there a way to limit that count subquery result only one with in a combined query ?

SELECT `ad_general`.`id`, 
    ( SELECT  count(`ad_general`.`id`) AS count 
        FROM (`ad_general`) 
        WHERE `city` = 708 ) AS count, 
  FROM (`ad_general`) 
  WHERE `ad_general`.`city` =  '708' 
  ORDER BY `ad_general`.`id` DESC
  LIMIT 15

May be using a join can solve the problem but dunno how ?

Answer 1

SELECT ad_general.id, stats.cnt
FROM ad_general
  JOIN (
      SELECT count(*) as cnt
        FROM ad_general
        WHERE city = 708
    ) AS stats
WHERE ad_general.city = 708
ORDER BY ad_general.id DESC
LIMIT 15;

The explicit table names aren’t required, but are used both for clarity and maintainability (the explicit table names will prevent any imbiguities should the schema for ad_general or the generated table ever change).