oracle中如何定义非空字段?
rt~~~~
not null or no null?
------解决方案--------------------create table aa(id number not null);
或者
SQL> create table aa(id number);
Table created.
Elapsed: 00:00:00.00
SQL> alter table aa modify id number not null;
Table altered.
Elapsed: 00:00:00.00
------解决方案--------------------not null