Question

I am not expert in sql and I need help with the following query. It is poorly optmized and it takes too long time to execute.
Is it possible to replace IN() with JOIN() to speed up the query?
How to do it?

SELECT * 
FROM   shop_orders 
WHERE  id IN (SELECT orders_id 
              FROM   shop_orders_data 
              WHERE  closed = '1' /*AND backorder='0'*/) 
       AND id IN (SELECT orders_id 
                  FROM   shop_orders_products 
                  WHERE  products_id IN (SELECT id 
                                         FROM   shop_products 
                                         WHERE  artno = '120000' 
                                                 OR name LIKE '%120000%')) 
ORDER  BY created DESC 

Answer 1

Select so.*
from shop_orders as so
     join shop_orders_data as sod on sod.orders_id = so.id
     join (select orders_id 
           from   shop_orders_products as sop
                  join shop_products as sp on sp.id = sop.products_id
           where  sp.artno = '120000' 
                  OR sp.name like '%120000%') as sop on sop.orders_id = so.id
where 
  sod.closed = '1'
order by so.created desc