insert into sz_sch_join_class ( school_id ,class_id,team, course_id, course_name,course_group) values (#{emp.schoolId,jdbcType=INTEGER}, #{emp.classId,jdbcType=INTEGER}, #{emp.team,jdbcType=VARCHAR} , #{emp.courseId,jdbcType=INTEGER}, #{emp.courseName,jdbcType=VARCHAR}, #{emp.courseGroup,jdbcType=INTEGER}) select max(course_group) from sz_sch_join_class select * from sz_sch_join_class where course_group = #{courseGroup} delete from sz_sch_join_class where course_group = #{courseGroup} delete from sz_sch_join_class where school_id = #{schoolId} and team = #{team} select * from sz_sch_join_class where school_id = #{schoolId} and team = #{team} and class_id = #{classId} and course_id = #{courseId} and course_name = #{courseName} and course_group =#{courseGroup}