180. Consecutive Numbers
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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.
Code
# 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 l1.Id = l3.Id-2 and l1.Num = l2.Num and l1.Num = l3.Num
Idea
For this kind of problems, you need to have multiple instances of the same table (Logs l1, Logs l2, Logs l3).