小编brg*_*eek的帖子

根据user_id我在子句中使用的查询，我遇到了性能问题WHERE。

这个问题描述了一个非常相似的问题，但不完全相同：

• PostgreSQL 过滤器/聚合性能根据条件值而波动

这是我的查询：

select inlineview.user_search_id, inlineview.user_id, 
       to_char(timezone('UTC', to_timestamp(date_part('epoch', 
       inlineview.last_access_date))),'YYYY-MM-DD"T"HH24:MI:SS.MSZ') 
       last_access_date,
       to_char(timezone('UTC', to_timestamp(date_part('epoch', 
       inlineview.sys_creation_date))),'YYYY-MM-DD"T"HH24:MI:SS.MSZ') 
       sys_creation_date, b.product_id,
       to_char(timezone('UTC', to_timestamp(date_part('epoch', 
       b.last_prov_change))),'YYYY-MM-DD"T"HH24:MI:SS.MSZ') 
      last_prov_change,b.product_type,b.tlc_id,b.prod_history_id,
      coalesce(d.address_id,-1) address_id,coalesce(d.locality_name,'') 
      locality_name,
      coalesce(d.post_code_zone,'') post_code_zone,
      coalesce(d.road_name_concat,'') 
      road_name_concat,coalesce(d.street_num_concat,'') street_num_concat,
      coalesce(d.address_name,'') address_name,
      coalesce(d.town_name,'') town_name
from
    (select a.user_search_id, 
            a.user_id,a.last_access_date,
            a.sys_creation_date,a.product_id
     from linetest.user_search a
    where a.user_id = '818901'
    order by a.last_access_date desc limit 10) inlineview, 
 linetest.prod_history b left outer join linetest.address d on d.tlc_id = b.tlc_id 
 where b.product_id = inlineview.product_id
   and b.prod_history_id = (select c.prod_history_id 
                            from linetest.prod_history c
                            where …