力扣——连续出现的数字（数据库的题

Posted 2021-02-07 jaypark

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 ConsecutiveNums from Logs l1 join Logs l2 on l1.id=l2.id-1 join Logs l3 on l1.id=l3.id-2 where l1.num=l2.num and l2.num=l3.num