SELECT user_name, user_editcount, user_registration, MAX(rev_timestamp) AS 'Last edit'

FROM `user`

JOIN user_groups ug1

    ON user_id = ug1.ug_user AND ug1.ug_group = 'extendedconfirmed'

LEFT JOIN user_groups ug2

    ON user_id = ug2.ug_user AND ug2.ug_group = 'sysop'

LEFT JOIN user_groups ug3

    ON user_id = ug3.ug_user AND ug3.ug_group = 'bot'

LEFT JOIN ipblocks

    ON user_id = ipb_user

JOIN revision_userindex

    ON user_id = rev_user

WHERE user_editcount >= 10000

    AND user_registration <= 20150527000000

    AND ug2.ug_group IS NULL

    AND ug3.ug_group IS NULL

    AND ipb_id IS NULL

GROUP BY usre_name, user_editcount, user_registration;