MySQL - Optimize Queries Runtime - mysql

Question

I am working with the tpch database and have a query that I want to optimize with faster runtimes.
I tried adding indexes and views to the query, but they are not improving performance. Could someone please provide suggestions? Thanks.
Connection:
conn = mysql.connect(host = 'relational.fit.cvut.cz', port = int(3306), user = 'guest', passwd = 'relational', db = 'tpch')
Query:
WITH customer_lifetime_value AS (
SELECT
c_custkey,
c_name,
c_address,
c_nationkey,
c_phone,
c_acctbal,
c_mktsegment,
c_comment,
SUM(o_totalprice) AS ltv
FROM customer
JOIN orders
ON o_custkey = c_custkey
GROUP BY 1, 2, 3, 4, 5, 6, 7, 8
)
SELECT
r_name,
MAX(ltv) AS best_customer_value
FROM region
JOIN nation
ON n_regionkey = r_regionkey
JOIN customer_lifetime_value clv
ON clv.c_nationkey = n_nationkey
GROUP BY 1;

Answer 1

Could you try this? It should read less data and give you the same output:
WITH customer_lifetime_value AS
(
SELECT o_custkey
,SUM(o_totalprice) AS ltv
FROM orders
GROUP BY o_custkey
)
SELECT
r_name,
MAX(ltv) AS best_customer_value
FROM customer_lifetime_value
JOIN customer
ON o_custkey = c_custkey
JOIN nation
ON c_nationkey = n_nationkey
JOIN region
ON n_regionkey = r_regionkey
GROUP BY r_name
If it is correct, you can create simple indexes:
on orders table including only the o_custkey and o_totalprice
on customer table including only c_custkey and c_nationkey