In what order are MySQL JOINs evaluated?

Question

I have the following query:

SELECT c.*
FROM companies AS c
JOIN users AS u USING(companyid)
JOIN jobs AS j USING(userid)
JOIN useraccounts AS us USING(userid         


        

Answer 1

In MySQL, it's often interesting to ask the query optimizer what it plans to do, with:

EXPLAIN SELECT [...]

See "7.2.1 Optimizing Queries with EXPLAIN"