Help:Oracle 9i Active database trigger for insert

Question

Pract 4:Active Databases
Create a table emp1 (eno, ename, hrs, pno, super_no) and
project (pname, pno, thrs, head_no) where
thrs is the total hours and is the derived attribute.
Its value is the sum of the hrs of all employees working
on that project, eno and pno are primary keys,
head_no is the foreign key to emp relation.
Insert 10 tuples and write triggers to do the following
1) Creating a trigger to insert a new employee tuple and
display the new total hours from project table.
2) Creating a trigger to change the hrs of
existing employee and display the new      total hrs from project table
3) Creating a trigger to change the project of an employee and
display the new total hrs from project table
4) Creating a trigger to deleting the project of an employee
--using bom1:-
SQL> connect hr/tiger@bom4;
Connected.
SQL> create table Project17
2 (
3 pno number(5) primary key,
4 pname varchar2(25),
5 thrs number(5),
6 head_no number(5)
7 );
Table created.
SQL> create table Emp17
2 (
3 eno number(5) primary key,
4 ename varchar2(25),
5 hrs number(5),
6 pno number(5),
7 super_no number(5),
8 constraint Pno_fk foreign key(pno) references Project17(pno)
9 );
Table created.
--Inserting records into table Emp1
SQL> insert into Project17 values(1,'IMS',125,1);
1 row created.
SQL> insert into Project17 values(2,'CRM',135,1);
1 row created.
SQL> insert into Project17 values(3,'P and A Section',145,2);
1 row created.
SQL> insert into Project17 values(4,'Rishabh Dighia Steels',225,3);
1 row created.
SQL> insert into Project17 values(5,'BPTLibrary',215,4);
1 row created.
--Inserting records into table Project
SQL> insert into Emp17 values(3,'Shubhangi',145,3,28);
1 row created.
SQL> insert into Emp17 values(4,'Crima',225,2,98);
1 row created.
SQL> insert into Emp17 values(5,'Harshada',215,4,62);
1 row created.
SQL> insert into Emp17 values(6,'ashish',215,4,62);
1 row created.
SQL> insert into Emp17 values(7,'salil',115,3,92);
1 row created.
                    Queries:-
connect hr/tiger@bom4;
1) Create a trigger to insert a new emp tuple and display the new total hrs
from project table
create or replace trigger trigemp_ins
after insert on Emp17
for each row
when(new.pno is not null)
declare
vthrs number(9);
begin
insert into Project17 values(:new.pno,pname,thrs,head_no);
Select thrs into vthrs from Project17 where pno=:new.pno and thrs=thrs+:new.hrs;
dbms_output.put_line('new Total Hrs:'||vthrs);
end;
Warning: Trigger created with compilation errors.
SQL> show errors;
Errors for TRIGGER TRIGEMP_INS:
LINE/COL ERROR
4/2 PL/SQL: SQL Statement ignored
4/51 PL/SQL: ORA-00984: column not allowed here

Answer 1

Hi,
have a look at your insert. It misses some ":new."
Herald ten Dam
Superconsult.nl