LEETCODE数据库:180.ConsecutiveNumbers

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

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.

ConsecutiveNums
1

题解

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# Write your MySQL query statement below
SELECT DISTINCT s1.Num ConsecutiveNums
FROM Logs s1,Logs s2,Logs s3
WHERE s1.Num=s2.Num AND s1.Num=s3.Num AND s1.Id=s2.Id+1 AND s1.Id=s3.Id-1;

注意

  • 找上下行Num数值和自身相同的行，distinct去重输出即可。