oracle建库建表的各种命令

表:db_action create table db_action (id number(4) PRIMARY KEY CONSTRAINT id_nn NOT NULL,act_name VARCHAR2(50),act_award_number number(4),act_info VARCHAR2(50), act_data date); 插入表的记录: insert into db_action values(testaction.nextval,'庆祝50周年',1000,'本次活是庆祝',TO_DATE('03-JAN-1990', 'dd-MO