180606_consecutivly_count
2018-06-06 本文已影响0人
郑磊_4135
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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 |
SELECT DISTINCT l1.Num as ConsecutiveNums
FROM Logs l1, Logs l2, Logs l3
WHERE l1.Id = (l2.Id - 1) AND l2.Id = (l3.Id - 1)
AND l1.Num = l2.Num AND l2.Num = l3.Num
