Question

Some may or may not consider this a complex statement, but for me (since I’ve only been doing statement for about a month) this one is. The below statement returns me the exact results I am looking for, but my problem is that it take over 95 seconds to run on a iMac. I need this statement to run on an iPhone. Can anyone thing of a better (quicker) way to do this?

select categories.category  
from categories join categories_listings 
where categories_listings.category_id = categories.id
  and categories.association_id = 1 
  and (select count(*) 
       from (select (
                    select categories.category 
                    from categories left join categories_listings 
                    where categories_listings.category_id = categories.id
                      and categories.association_id = 1 
                      and listings.id = categories_listings.listing_id) as region 
             from listings left join chamber_specifics
               on chamber_specifics.listing_id=listings.id 
             where region = categories.category  
               and listings.association_id=1 
               and listings.status = 1 
               and downtown='Y')) >0 
group by categories.category;

Let me know if more info is needed.

Thanks!

Answer 1

I came up with a statement that gets me the same results as in my question, but much fast at about 0.062 seconds to complete. Below is my Statement: (Thanks Rudu for the direction!)

select (
        select categories.category 
        from categories left join categories_listings 
        where categories_listings.category_id = categories.id  
        and categories.association_id = 1 
        and listings.id = categories_listings.listing_id) as region 
  from listings left join chamber_specifics 
    on chamber_specifics.listing_id=listings.id 
  where  listings.association_id=1 
  and listings.status = 1   
  and downtown='Y' 
group by region