创建表:create ;删除表:drop;查询:select;
增加:insert into ;删除列:delect;修改:update;
分组:group by;表连接:join、left join、right join、cross join;
去除重复:distinct;表连接过滤:having;视图(虚表):view;
序列号:rownum;字段属性:constratint;索引:index;序列:sequence;
PL_SQL:declare-begin-end;游标:cursor;存储过程:procedure;方法:function;
触发器:trigger;
………………待续