create table a(b int, cvarchar2(5));建一个序列create sequence a_seq increment by 1 start with 100;建一个触发器create or replace trigger t_abefore insert on afor each rowbeginselect s_a.nextval into :new.b from dual;end;
create or replace trigger t_abefore insert on my_tablefor each rowbeginselect max(my_id)+1 into :new.my_id from my_table;end;
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