1.因为连续出现三个ID减一
2.as可以省略
# Write your MySQL query statement below
SELECT DISTINCT
l1.Num AS ConsecutiveNums
FROM
Logs as l1,
Logs as l2,
Logs as l3
WHERE
l1.Id = l2.Id - 1
AND l2.Id = l3.Id - 1
AND l1.Num = l2.Num
AND l2.Num = l3.Num