LeetCode: 180. 连续出现的数字¶
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