mysql查找某连续字段中断的编号

    查询dj_pxlb表中zwh 空缺的值

         select model2.zwh-1 as kqzwh from (select model1.zwh from dj_pxlb as model1 where model1.ccbh ='abc' order by model1.zwh desc) as model2 where model2.zwh>1 and not exists (select model3.zwh from dj_pxlb as model3 where  model3.ccbh ='abc' and model3.zwh=model2.zwh-1);