sql查询n天前的数据

查询 >3天的数据

select created_at,vm_state,memory_mb,vcpus from nova.instances where created_at<curdate()-interval 3 day and vm_state!="deleted";

查询3天前至今的数据

select created_at,vm_state,memory_mb,vcpus from nova.instances where created_at>=curdate()-interval 3 day and vm_state!="deleted";