Sort by order of values in a select statement “in” clause in mysql

Question

I\'m selecting a set of account records from a large table (millions of rows) with integer id values. As basic of a query as one gets, in a sense. What I\'m doing us build

Answer 1

You're first query surely uses an order by clause. So, you could just do a join, and use the same order by clause.

For example, if this was your first query

SELECT customer_id
  FROM customer  
 WHERE customer_id BETWEEN 1 AND 100 
ORDER
    BY last_name

And this was your second query

SELECT inventory_id
  FROM rental
 WHERE customer_id in (...the ordered list...)

Combined would be

SELECT r.inventory_id
  FROM rental r
INNER
  JOIN customer c
    ON r.customer_id = c.customer_id    
 WHERE c.customer_id BETWEEN 1 AND 100 
ORDER
    BY c.last_name