180.连续出现的数字

SQL架构

编写一个 SQL 查询，查找所有至少连续出现三次的数字。

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

例如，给定上面的 Logs 表， 1 是唯一连续出现至少三次的数字。

+-----------------+
| ConsecutiveNums |
+-----------------+
| 1               |
+-----------------+

# Write your MySQL query statement below
SELECT DISTINCT L1.Num as ConsecutiveNums
FROM Logs L1, Logs L2, Logs L3
WHERE L2.Id = L1.Id + 1
AND L3.Id = L2.Id + 1
AND L1.Num = L2.Num
AND L2.Num = L3.Num