ORACLE建立主鍵自增表

--建立表，設定主鍵自增

create table stu(

uerid number(4) not null primary key,
username varchar(20),
userpass varchar(20),
email varchar2(30),
grade number(5)
);commit;

--小查一下

select * from stu;

--建立主鍵自增序列

create sequence emp_sequence

increment by 1
start with 1
nomaxvalue
nocycle
nocache;
commit;

--建立觸發器

create trigger "trigger_on_stu" before

insert on stu for each row when (new.uerid is null)
begin
select emp_sequence.nextval into :new.uerid from dual;
end;

--插入資料

insert into stu(username,userpass,email,grade) values('admin','admin','[email protected]',1);

insert into stu(username,userpass,email,grade) values('dhy','dhy','[email protected]',1);
insert into stu(username,userpass,email,grade) values('nsr','nsr','[email protected]',1);
insert into stu(username,userpass,email,grade) values('adamin','addmin','[email protected]',5);
insert into stu(username,userpass,email,grade) values('dhay','dhay','[email protected]',3);
insert into stu(username,userpass,email,grade) values('ansr','ansr','[email protected]',4);
commit;

--檢視資料

select * from stu;

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