SELECT A.*,IFNULL(B.RoomName,'') AS RoomName,IFNULL(T.TeacherName,'') AS TeacherName,IFNULL(T.TeacherHead,'') AS UserIcon
SELECT A.*,IFNULL(B.RoomName,'') AS RoomName,IFNULL(T.TeacherName,'') AS TeacherName,IFNULL(T.TeacherHead,'') AS UserIcon,IFNULL(C.ClassName,'') AS ClassName
FROM RB_Class_Plan AS A LEFT JOIN rb_class_room AS B ON A.ClassRoomId=B.RoomId
LEFT JOIN rb_teacher AS T ON A.TeacherId=T.TId
LEFT JOIN rb_class AS C ON A.ClassId=C.ClassId
WHERE 1=1
");
builder.AppendFormat(" AND A.{0}={1} ",nameof(RB_Class_Plan_ViewModel.Status),(int)DateStateEnum.Normal);