sql - Oracle Trigger - Condition before insert -


i don't know problem when created new trigger. syntax correct? thanks! console logging pane

p/s: console display when try insert values 

create or replace trigger ex03_3   before insert on hr.chitietdathang  each row  declare       tonghang number; -- total items        hanghienco number; -- items present      hangdaban number; -- items sales.  begin      -- total items      select sum(mh.soluong) tonghang      hr.mathang mh;        -- total items sales      select sum(ctdh.soluong) hangdaban      hr.chitietdathang ctdh;            -- items present      hanghienco := tonghang - hangdaban;            if(hanghienco >= hangdaban)          hanghienco := hanghienco-1;          insert hr.chitietdathang values(:new.sohoadon,:new.mahang,              :new.giaban,:new.soluong,:new.mucgiamgia);          rollback;      end if;    null;  end;

seem 2 critical mistakes

1) trigger tries insert hr.chitietdathang in body of insert trigger of hr.chitietdathang.

2) use rollback after insert statement useless.

note : can see nothing relevant make raise no_data_found in select statements. ex03_3 , ex04_4 confused, kaushik nayak says.


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