MySQL LEFT JOIN, GROUP BY and ORDER BY not working as required

Question

I have a table

\'products\' => (\'product_id\', \'name\', \'description\') 

and a table

\'product_price\' => (\'pro         


        

Answer 1

This will give you the last updated price:

select
  p.*, pp.price
from
  products p,
  -- left join this if products may not have an entry in prodcuts_price
  -- and you would like to see a null price with the product
  join 
  (
      select 
        product_price_id, 
        max(date_updated) 
      from products_price
      group by product_price_id
   ) as pp_max
    on p.product_id = pp.product_id
  join products_price pp on 
    pp_max.prodcuts_price_id = pp.products_price_id