course_id, course_name, course_logo, course_desc, course_hours, course_teacher, is_valid, gallery, reserved1, time select a.course_type_re_id,a.course_id,b.course_name,b.course_logo,b.course_hours,b.course_teacher,b.time from (select * from course_type_relation where course_type_id=#{typeId}) as a left join course as b on a.course_id = b.course_id WHERE b.is_valid = 1 ORDER BY a.course_id DESC SELECT FROM course WHERE course_teacher LIKE "%"#{name}"%" AND is_valid = 1 ORDER BY course_id DESC SELECT FROM course WHERE course_name LIKE "%"#{name}"%" AND is_valid = 1 ORDER BY course_id DESC SELECT FROM course is_valid = #{valid} ORDER BY course_id DESC