MySQL 获取连续范围

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1、原始数据

2、把running_number转成数据，并加上一列有序数字

SELECT d.running_number+0 running_number,@a:=@a+1 rn FROM device_data d,(SELECT @a:=0) a where d.device_id=13 order by d.running_number;

加上有序数据

3、running_number与有序数据的差，差(diff)相同的的running_number说明是连续的

SELECT running_number,rn,running_number-rn diffFROM (SELECT d.running_number+0 running_number,@a:=@a+1 rn FROM device_data d,(SELECT @a:=0) a where d.device_id=13) b;

比较数据

4、根据差来分组，并获得相关差的最小及最大running_number，就形成了连续范围

select min(c.running_number) min,max(c.running_number) maxfrom(SELECT running_number,rn,running_number-rn diff  FROM (SELECT d.running_number+0 running_number,@a:=@a+1 rn FROM device_data d,(SELECT @a:=0) a where d.device_id=13) b)c group by diff;

连续范围

5、参考《MySQL技术内幕：SQL编程》 2.6.2连续范围问题

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