按照你的意思,其实就是将两个结果集Union起来,没有值的话即为Null 如下: select 时间,字段2,字段3,null as 字段4,null as 字段5 from a union all select 时间,null as 字段2,null as 字段3,字段4,字段5 from b 解释:因为...
