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/*´´½¨±í*/
create table USERS
(
ID NUMBER not null,
NAME VARCHAR2(50) not null,
PASSWORD VARCHAR2(50) not null
)
/*´´½¨ÐòÁÐ*/
create sequence s_id increment by 1 start with 1 nomaxvalue nocycle;
/*´´½¨´¥·¢Æ÷*/
create or replace trigger USERS_TRIGGER
before insert on USERS
referencing old as old_value new as new_value
for each row WHEN (new_value.id is null)
begin
Select s_id.nextval into: new_value.id from dual;
end;
/*²åÈëÊý¾Ý*/
INSERT INTO USERS(NAME,PASSWORD) VALUES('AA','BB')
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create sequence s_id increment by 1 start with 1 nomaxvalue nocycle;
/*´´½¨´¥·¢Æ÷*/
create or replace trigger USERS_TRIGGER
before insert on USERS
for each row WHEN (new.id is null)
begin
:new.id:= s_id.nextval;
end;
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