県を一つ指定して検索した場合

0.url.txt

/search?category_id=7&prefecture_ids%5B%5D=12&occupation_id=54

1.1.sql

mysql> explain 
    -> SELECT  DISTINCT `job_offers`.`id`, `job_offers`.`status` AS alias_0, `job_offers`.`created_at` AS alias_1 
    -> FROM 
    -> `job_offers` LEFT OUTER JOIN `occupations` ON `occupations`.`id` = `job_offers`.`occupation_id` LEFT OUTER JOIN `job_offer_appeals` ON `job_offer_appeals`.`job_offer_id` = `job_offers`.`id` LEFT OUTER JOIN `appeals` ON `appeals`.`id` = `job_offer_appeals`.`appeal_id` AND `appeals`.`type` IN ('Appeal::JobAppeal') LEFT OUTER JOIN `job_offer_skills` ON `job_offer_skills`.`job_offer_id` = `job_offers`.`id` LEFT OUTER JOIN `skills` ON `skills`.`id` = `job_offer_skills`.`skill_id` LEFT OUTER JOIN `display_skills` ON `display_skills`.`id` = `skills`.`display_skill_id` 
    -> WHERE 
    -> `job_offers`.`office_location_prefecture_id` = 12 
    -> AND `job_offers`.`occupation_id` = 54 
    -> AND `job_offers`.`public` = 1
    -> ORDER BY 
    -> `job_offers`.`status` DESC, `job_offers`.`created_at` DESC LIMIT 10 OFFSET 0
    -> \G;
*************************** 1. row ***************************
           id: 1
  select_type: SIMPLE
        table: job_offers
         type: ALL
possible_keys: index_job_offers_on_occupation_id,index_job_offers_on_public_and_status_and_created_at,index_job_offers_on_public_and_status_and_max_unit_price,idx
          key: NULL
      key_len: NULL
          ref: NULL
         rows: 4090
        Extra: Using where; Using temporary; Using filesort
*************************** 2. row ***************************
           id: 1
  select_type: SIMPLE
        table: occupations
         type: const
possible_keys: PRIMARY
          key: PRIMARY
      key_len: 4
          ref: const
         rows: 1
        Extra: Using index; Distinct
*************************** 3. row ***************************
           id: 1
  select_type: SIMPLE
        table: job_offer_appeals
         type: ref
possible_keys: index_job_offer_appeals_on_job_offer_id_and_appeal_id,index_job_offer_appeals_on_job_offer_id
          key: index_job_offer_appeals_on_job_offer_id_and_appeal_id
      key_len: 4
          ref: crowdtech_dev.job_offers.id
         rows: 1
        Extra: Using index; Distinct
*************************** 4. row ***************************
           id: 1
  select_type: SIMPLE
        table: appeals
         type: eq_ref
possible_keys: PRIMARY
          key: PRIMARY
      key_len: 4
          ref: crowdtech_dev.job_offer_appeals.appeal_id
         rows: 1
        Extra: Using where; Distinct
*************************** 5. row ***************************
           id: 1
  select_type: SIMPLE
        table: job_offer_skills
         type: ref
possible_keys: index_job_offer_skills_on_job_offer_id_and_priority_order,index_job_offer_skills_on_job_offer_id_and_skill_id,index_job_offer_skills_on_job_offer_id
          key: index_job_offer_skills_on_job_offer_id_and_priority_order
      key_len: 5
          ref: crowdtech_dev.job_offers.id
         rows: 1
        Extra: Distinct
*************************** 6. row ***************************
           id: 1
  select_type: SIMPLE
        table: skills
         type: eq_ref
possible_keys: PRIMARY
          key: PRIMARY
      key_len: 4
          ref: crowdtech_dev.job_offer_skills.skill_id
         rows: 1
        Extra: Distinct
*************************** 7. row ***************************
           id: 1
  select_type: SIMPLE
        table: display_skills
         type: eq_ref
possible_keys: PRIMARY
          key: PRIMARY
      key_len: 4
          ref: crowdtech_dev.skills.display_skill_id
         rows: 1
        Extra: Using index; Distinct
7 rows in set (0.00 sec)