optimize select with SUM … CASE

Question

is there any way to optimize this query:

select 
orders_id,
orders_products_id,
sum(CASE products_options_id WHEN 1 THEN products_options_values_id ELSE 0 END) as color,
sum(CASE products_options_id WHEN 2 THEN products_options_values_id ELSE 0 END) as talle

from 
orders_products_attributes 

group by 
orders_products_id

This is the EXPLAIN output:

id  select_type   table                       type   possible_keys   key   key_len   ref     rows   Extra
1   SIMPLE        orders_products_attributes  ALL    NULL            NULL  NULL      NULL  69006  Using temporary; Using filesort

Thanks!

Luciano

Answer 1

I would suggest creating a covering index for this query, using the columns (orders_product_id, products_options_id, orders_id).

CREATE INDEX ix_opa_opid_poid_oid
    ON orders_products_attributes (orders_product_id, products_options_id, orders_id)