SQL中NULL字段

简单查看下securitygrouprules表字段

select * from neutron.securitygrouprules limit 1,10

remote_group_id字段信息:

筛选不为NULL字段信息

select * from neutron.securitygrouprules where remote_group_id!='';

筛选为NULL字段信息

select * from neutron.securitygrouprules where remote_group_id is NULL;