数据库表的常规操作

=================Oracle==================

1.创建表

Create table [tableName](id int,name varchar2(64));

2.删除表

drop table [tableName];

3.修改表

alert table [tableName] add newColumn varchar2(64);

comment on table [tableName] is ‘表的描述‘;

comment on column [tableName.column] is ‘列的描述‘;

4.查询表

select * from [tableName];