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LeetCode: 180. 连续出现的数字

• LeetCode: 180. 连续出现的数字
  • 1、题目描述
  • 2、解题思路

1、题目描述

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               |
+-----------------+

2、解题思路

# Write your MySQL query statement below

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 l1.Num = L3.Num