PL SQL trigger When Insert a table insert into another Table - oracle

Question

I attached two table below I need a trigger when insert do_chd table in same time insert in do_chd_hist table And DO_MST table to DO_MST_HIST TAbLE
create table do_mst
( fdo_no varchar2(14) not null,
fdo_date date not null,
code_db varchar2(11),
db_name varchar2(25),
code_sdb varchar2(11),
sdb_name varchar2(25),
code_sst varchar2(11),
sst_name varchar2(25),
constraint fdo_no_pk primary key(fdo_no)
);
create table do_mst_hist
( fdo_no varchar2(14) not null,
fdo_date date not null,
code_db varchar2(11),
db_name varchar2(25),
code_sdb varchar2(11),
sdb_name varchar2(25),
code_sst varchar2(11),
sst_name varchar2(25),
constraint fdo_no_pk primary key(fdo_no)
);
create table do_chd
( fdo_no varchar2(14) not null,
itemcode varchar2(11) not null,
name varchar(27) not null,
unit_price varchar2(11),
req_qty number(11) not null,
total_price number(14),
unit varchar2(7),
constraint fdo_no_fk foreign key(fdo_no)
references do_mst(fdo_no)
);
create table do_chd_hist
( fdo_no varchar2(14) not null,
itemcode varchar2(11) not null,
name varchar(27) not null,
unit_price varchar2(11),
req_qty number(11) not null,
total_price number(14),
unit varchar2(7),
constraint fdo_no_fk foreign key(fdo_no)
references do_mst(fdo_no)
);
Can anybody help me to write this trigger?

Answer 1

While I agree with what being said in the comments, I don't think there's a reason to think twice about writing up a create trigger syntax, and I'm happy to show you the solution to your problem:
CREATE OR REPLACE TRIGGER do_chd_insert_trg
AFTER INSERT do_chd
FOR EACH ROW
DECLARE
sal_diff number;
BEGIN
insert into do_chd_hist
values (new.fdo_no, new.itemcode, new.name, new.unit_price, new.req_try, new.total_price, new.unit);
END;
/
You can use this syntax to generate the trigger to the second table, after changing the respectable column names.
You can read more about oracle trigger syntax here -
https://docs.oracle.com/cd/B19306_01/appdev.102/b14251/adfns_triggers.htm