註釋: comment on table "TEST" is '這是註釋'; comment on column TEST.ID is '這是註釋';
缺省值: create table test(id int,createtime default sysdate not null );//建表時創建 alter table test modify createtime default sysdate;//建表後修改
註釋: comment on table "TEST" is '這是註釋'; comment on column TEST.ID is '這是註釋';
缺省值: create table test(id int,createtime default sysdate not null );//建表時創建 alter table test modify createtime default sysdate;//建表後修改