Question Definition
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.
+-----------------+
| ConsecutiveNums |
+-----------------+
| 1 |
+-----------------+
Java Solution
Select DISTINCT l1.Num AS ConsecutiveNums from Logs l1, Logs l2, Logs l3
where l1.Id=l2.Id-1 and l2.Id=l3.Id-1
and l1.Num=l2.Num and l2.Num=l3.Num
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