README.md

180. 连续出现的数字

English Version

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

解法

SQL

select distinct(Num) as ConsecutiveNums from Logs Curr where 
    Num = (select Num from Logs where id = Curr.id - 1) and
    Num = (select Num from Logs where id = Curr.id - 2)