Consecutive Numbers

Write a SQL query to find all numbers that appear at least three times consecutively.

+----+-----+
| Id | Num |
+----+-----+
| 1  |  1  |
| 2  |  1  |
| 3  |  1  |
| 4  |  2  |
| 5  |  1  |
| 6  |  2  |
| 7  |  2  |
+----+-----+

For example, given the above Logs table, 1 is the only number that appears consecutively for at least three times.

Solutions: select DISTINCT l1.Num FROM Logs as l1 join Logs as l2 join Logs as l3 where l1.Id = l2.Id + 1 And l2.Id = l3.Id + 1 And l1.Num = l2.Num And l2.Num = l3.Num