SELECT id FROM users WHERE active=1 AND about_me LIKE "%#challenge%" ORDER BY username ASC, num_followers DESC
0.01484
SELECT id FROM users WHERE tags REGEXP "(^|\,| )#challenge($|\,)" ORDER BY username ASC
0.03650
SELECT id FROM users WHERE active=1 AND (username LIKE "%#challenge%" OR fullname LIKE "%#challenge%" OR position LIKE "%#challenge%") ORDER BY username ASC
0.01140
SELECT id FROM users WHERE active=1 AND (username="#challenge" OR fullname="#challenge" OR position="#challenge") ORDER BY username ASC