ORA-00933: SQL command not properly ended? Enter Bind Variables? - sql

Question

I am attempting to write out in my SQL commands for Oracle Apex 5, and I cannot see why I'm getting an error. Also, a popup window appears once I submit asking to 'Enter Bind Variables' for ':NEW'? Isn't it already declared?
drop table tmpcapacityguide cascade constraints;
drop table tmpcaravanpark cascade constraints;
create table tmpcaravanpark as select * from Caravan_park;
create table tmpcapacityguide
(mincap number(3),
maxcap number(3));
insert into tmpcapacityguide values(30, 150);
CREATE OR REPLACE TRIGGER "PARK_CAPACITY_CHECK"
before insert or update of capacity
on Caravan_park
for each row
when (:new.capacity < 30) DECLARE
mincapacity integer;
maxcapacity integer;
begin
select mincap, maxcap
into mincapacity, maxcapacity
from tmpcapacityguide
where capacity = :new.capacity;
if (new.capacity < mincapacity)
then raise_application_error(-20601, 'Capacity must be between 30 and 150');
end if;
end;

Answer 1

:new.capacity is input and has to be declared. For more info see here: http://www.akadia.com/services/ora_bind_variables.html

Answer 2

Try using slashes, and name of trigger after last end, and also You do not need ":" sign before new variable in IF statement:
drop table tmpcapacityguide cascade constraints;
drop table tmpcaravanpark cascade constraints;
create table tmpcaravanpark as select * from Caravan_park;
create table tmpcapacityguide (mincap number(3), maxcap number(3));
/
insert into tmpcapacityguide values(30, 150);
/
CREATE OR REPLACE TRIGGER PARK_CAPACITY_CHECK
before insert or update of capacity on caravan_park
for each row
when (new.capacity < 30)
declare
mincapacity integer;
maxcapacity integer;
begin
select mincap, maxcap
into mincapacity, maxcapacity
from tmpcapacityguide
where capacity = :new.capacity;
if (new.capacity < mincapacity)
then
raise_application_error(-20601, 'Capacity must be between 30 and 150');
end if;
end PARK_CAPACITY_CHECK;
/
Also, You should execute it as a script, not statement in SQL Developer. This can be done by pressing F9, not F5, as sstated here.
EDIT:
As for Your ORA-00904 error, You still do not have capacity column in Your tmpcapacityguide table. And You try to use it here:
select mincap, maxcap
into mincapacity, maxcapacity
from tmpcapacityguide
where capacity = :new.capacity;