leetcode-180-Consecutive-Numbers

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描述

Write a SQL query to find all numbers that appear at least three times consecutively.

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+----+-----+
| Id | Num |
+----+-----+
| 1  |  1  |
| 2  |  1  |
| 3  |  1  |
| 4  |  2  |
| 5  |  1  |
| 6  |  2  |
| 7  |  2  |
+----+-----+

For example, given the above Logs table, 1 is the only number that appears consecutively for at least three times.

分析

找出 Id 连续且值相同的 Num

解决方案(MySQL)

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# Write your MySQL query statement below
SELECT DISTINCT(t1.Num) as ConsecutiveNums FROM Logs t1, Logs t2, Logs t3
WHERE t1.Id=t2.Id-1 AND t2.Id=t3.Id-1 AND
t1.Num=t2.Num AND t2.Num=t3.Num

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