注释: comment on table "TEST" is '这是注释'; comment on column TEST.ID is '这是注释';
缺省值: create table test(id int,createtime default sysdate not null );//建表时创建 alter table test modify createtime default sysdate;//建表后修改
注释: comment on table "TEST" is '这是注释'; comment on column TEST.ID is '这是注释';
缺省值: create table test(id int,createtime default sysdate not null );//建表时创建 alter table test modify createtime default sysdate;//建表后修改