How can I speed up this query?

MySQL & MariaDB Other MySQL® Questions
1

Hi,

Can anyone help? I have 2 table each over 2M records and it is taking ages retrieving records.

  1. A ‘product’ table that contains all products in store.

  2. The second table is the ‘offer’ table which contains all offers related to the products (e.g price,store,product condition).

  3. ‘product’ table fields
    [pid, country, category, image]

  4. ‘offer’ table fields
    [offer_id, pid, store_id, condition, price, title, stock]

  5. I need to get the image, min(price) and title for each new product.

Current Query:
SELECT * FROM product x, offer y
WHERE x.pid=y.pid AND x.country = ‘US’ AND x.category like ‘auto|accessories’ AND y.condition = ‘new’
AND y.price=( select min(z.price) from pdt_offer z
where z.pid=y.pid AND z.quality=‘new’ AND z.stock>0)
AND y.stock >0
GROUP BY x.pid

Is there a better way to do this?

Thanks

Ee Loon

2

You might start off by creating a categories table and replacing the ‘category’ char field in ‘product’ with a ‘categoryId’ integer field.

Do you have any indexes on your tables?

What is the pdt_offer table?