我用的是thinkphp3.1版本，这个SQL语句怎么在PHP控制台实现？

select t.id from (SELECT id,SUM(tf_idf) tf_idf FROM tb_inverted_jmu WHERE ( (keywords LIKE '%哈佛%' OR keywords LIKE '%大学%' OR keywords LIKE '%哈佛大学%') ) GROUP BY id) as t ORDER by t.tf_idf DESC