Which provides better performance one big join or multiple queries?

Question

i have a table called orders. one column on order is customer_id
i have a table called customers with 10 fields

Given the two options if i want to build up an array

Answer 1

Single join should be faster for two main reasons.

If you are querying over a network, then there is overhead in using number of queries instead of a single query.

A join would be optimized inside the DBMS using the query optimizer so will be faster than executing several queries.