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.

+-----------------+
| ConsecutiveNums |
+-----------------+
| 1               |
+-----------------+

大概意思是查出至少出现连续三次的数字

我的sql语句:

select distinct a.Num as ConsecutiveNums from Logs a,Logs b,Logs c
where (a.Id+1)=b.Id and (a.Id+2)=c.Id and a.Num=b.Num and a.Num=c.Num
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