数据库查询某一字段为空的数据
select * from t_bus_shop_type WHERE `school_id` = 1 or `school_id` is NULL and `status` != 3;html
是is null 不是= null数据库
select * from t_bus_shop_type WHERE `school_id` = 1 or `school_id` is NULL and `status` != 3;html
是is null 不是= null数据库