题目5：MySQL----------Consecutive Numbers
浏览数：34 /
时间：2015年06月12日
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.
题目解答
# Write your MySQL query statement below
select distinct Num from (
select
Num,
case
when @prevNum = Num then @count := @count + 1
when (@prevNum := Num) is not null then @count := 1
end n
from Logs, (select @prevNum := NULL) r
order by Id
) a where n >= 3
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