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Is there a noticeable difference between:
SELECT userid, username, userdept,
(SELECT deptname FROM depts WHERE deptid=userdept) AS deptname
FROM users
and
SELECT userid, username FROM users
INNER JOIN depts ON depts.deptid=users.userdept
Which one is better?
Your second query has better performance.
You can see this example: http://www.codersrevolution.com/index.cfm/2008/7/31/MySQL-performance-INNER-JOIN-vs-subselect