基本sql語句

//查看sequences
select * from user_sequences;
//查看當前sequences
select seq_plan_sm_user.currval from dual;
//查看下一個sequences
select seq_plan_sm_user.nextval from dual;
//更新Date
update plan_sm_user set createDate = to_date('2012-1-1', 'yyyy-MM-dd');
update plan_sm_user set createDate = sysdate;(插入系統當前時間)
//向帶有主鍵的表中插入一條記錄
insert into plan_sm_user(userId, emp_indo) values(seq_plan_sm_user.nextval, '60337899');
//增加一列
alter table plan_sm_user add benefitChanne varchar2(20);
//刪除一列
alter table plan_sm_user drop column benefitChanne;