SELECT (Name) FROM (table_lessons,table_rasp) WHERE (table_rasp.Lesson1 =
table_lessons._id);
SELECT (Name) FROM table_lessons,table_rasp WHERE table_rasp.Lesson2 =
table_lessons._id;
SELECT (Name) FROM table_lessons,table_rasp WHERE table_rasp.Lesson3 =
table_lessons._id;

SELECT Name, 1 sorting_order
    FROM table_lessons,table_rasp
    WHERE table_rasp.Lesson1 = table_lessons._id
UNION ALL
SELECT Name, 2
    FROM table_lessons,table_rasp
    WHERE table_rasp.Lesson2 = table_lessons._id
UNION ALL
SELECT Name, 3
    FROM table_lessons,table_rasp
    WHERE table_rasp.Lesson3 = table_lessons._id
ORDER BY sorting_order /* , Name */ ;

SELECT (Name) FROM (table_lessons,table_rasp)
  WHERE
    ((table_rasp.Lesson1 = table_lessons._id)
  or
    (table_rasp.Lesson2 = table_lessons._id)
  or
    (table_rasp.Lesson3 = table_lessons._id));