摘要：
SELECT company_name, title, teachername, company.id,averageFROM companies companyleft outer join (select ROUND(avg(score), 2) as average, company_id from companycomments group by company_id) companyco... 阅读全文
posted @ 2008-01-09 18:08 天生舞男 阅读(305) 评论(0) 推荐(0) 编辑