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 |
+-----------------+
C++ 代码
# 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 l2.Num = l3.Num