+----+--------+---------+--------+-------+
| Id | MainId | MainUrl |  Url   | Name  |
+----+--------+---------+--------+-------+
|  1 |        |         | /item1 | Item1 |
|  2 |        | /item1  | /item2 | Item2 |
|  3 |        | /item1  | /item3 | Item3 |
|  4 |        | /item1  | /item4 | Item4 |
|  5 |        | /item2  | /item5 | Item5 |
+----+--------+---------+--------+-------+

+----+--------+---------+--------+-------+
| Id | MainId | MainUrl |  Url   | Name  |
+----+--------+---------+--------+-------+
|  1 |        |         | /item1 | Item1 |
|  2 |    1   | /item1  | /item2 | Item2 |
|  3 |    1   | /item1  | /item3 | Item3 |
|  4 |    1   | /item1  | /item4 | Item4 |
|  5 |        | /item1  | /item5 | Item5 |
+----+--------+---------+--------+-------+