select course_uuid, count(id) as count from th_student_course where del_flag = 0 group by course_uuid SELECT sc.batch_uuid, count( sc.id ) AS count FROM ( SELECT DISTINCT id, create_by, course_uuid, create_time, batch_uuid, del_flag FROM th_student_course ) sc GROUP BY sc.batch_uuid SELECT sc.idcard, sc.course_uuid, sc.batch_uuid, sc.NAME, sc.finish_status, c.course_name, (( SELECT sum( cc.lesson_num ) FROM th_course_chapter cc WHERE cc.course_uuid = sc.course_uuid )) less_total FROM th_student_course sc LEFT JOIN th_course c ON c.uuid = sc.course_uuid WHERE sc.del_flag = 0 AND sc.batch_uuid = #{batchUuid} update th_student_course set finish_status = 1 where batch_uuid = #{batchUuid}