Trigger warning: created with compilation errors - database

Question

i have this trigger and it says Warning: Trigger created with compilation errors.
can you give me quick advice?
/
CREATE OR REPLACE TRIGGER type_check
BEFORE INSERT ON carrs
FOR EACH ROW
BEGIN
IF :new.weight > 3500
THEN
:new.type := 'nakladne';
ELSE
:new.type := 'osobne';
END IF;
END;
/
edit: i still got the same warning
edit: here is table definition
create table carrs (
id_Car Integer not null,
id_board_unit Integer not null,
id_evc_numbers Integer not null,
id_owner Integer,
weight Integer not null );
here are the errors:
LINE/COL ERROR
-------- -----------------------------------------------------------------
4/5 PLS-00049: bad bind variable 'NEW.TYPE'
6/5 PLS-00049: bad bind variable 'NEW.TYPE'

Answer 1

If you're using SQL*Plus, type show errors after getting that warning to display the list of syntax errors that were reported. It's far easier to diagnose problems when you know what they are rather than guessing.
At a minimum, your references to the :new pseudorecord need to include the colon prefix :new rather than new. The assignment operator in PL/SQL is also := not =. So, at a minimum, you'd want something like
CREATE OR REPLACE TRIGGER type_check
BEFORE INSERT ON carrs
FOR EACH ROW
BEGIN
IF :new.weight > 3500
THEN
:new.type := 'nakladne';
ELSE
:new.type := 'osobne';
END IF;
END;
There may be additional errors as well. If there are, type show errors and edit your question to include them.
If you wish to add a new column named type to your table, you would do that before creating your trigger. That's not a particularly good name for a column, though, since type is also a reserved word in Oracle. I'd choose something more meaningful like, say, carr_type. You'd have to specify how large the strings the new column would need to hold when creating it. I'll guess that you want space for 10 characters
ALTER TABLE carrs
ADD( carr_type VARCHAR2(10 CHAR) );
You then probably want to UPDATE your table to populate the new column for your existing data
UPDATE carrs
SET carr_type = (case when weight > 3500
then 'nakladne'
else 'osobne'
end)
before creating your trigger
CREATE OR REPLACE TRIGGER type_check
BEFORE INSERT ON carrs
FOR EACH ROW
BEGIN
IF :new.weight > 3500
THEN
:new.carr_type := 'nakladne';
ELSE
:new.carr_type := 'osobne';
END IF;
END;