Can select statement return 'No Record found' for each of invalid inputs.

Question

Let say when you select a invalid booking number, oracle will
return nothing, but do u know how to make oracle return a record
saying it's invalid?
Example, the following sql normally return 3 records cause
only 3 numbers are valid, is there anyway to make it return
4 records and indicate those invalid ones are invalid somehow.
select booking_service, BOOKING_NO from tb_booking where booking_no in ('valid1','INVALID', 'valid2', 'valid3')

Answer 1

Along the same lines you could use object types to achieve the same result. This would remove the need for a temporary table, and also allow you to create the list of ids to check with PL/SQL without i/o. As an example
CREATE TYPE booking_id_typ IS OBJECT (id NUMBER);
CREATE TYPE booking_id_list_typ IS TABLE OF booking_id_typ;
CREATE TABLE bookings (booking_id booking_id_typ);
(you could have booking_id as type NUMBER, but for consistency with subsequent SQL I've used booking_id_typ)
INSERT INTO bookings VALUES (booking_id_typ(10));
INSERT INTO bookings VALUES (booking_id_typ(20));
INSERT INTO bookings VALUES (booking_id_typ(40));
INSERT INTO bookings VALUES (booking_id_typ(50));
The following SQL statement creates a collection on the fly, rather than using an IN clause.
SELECT i.id booking_id, DECODE(b.booking_id.id, NULL, 'Invalid', 'Ok') status
FROM bookings b,
SELECT id
FROM TABLE(booking_id_list_typ(booking_id_typ(10), booking_id_typ(20), booking_id_typ(30), booking_id_typ(40)))
) i
WHERE i.id = b.booking_id.id (+)
BOOKING_ID STATUS
10 Ok
20 Ok
30 Invalid
40 Ok
This SQL statement works in 9i. I get the following error in 8i, but you might be able to CAST the TABLE to booking_id_list_typ, or depending on your application, create a PL/SQL variable of type booking_id_list_typ and CAST that instead.
ERROR at line 5:
ORA-22905: cannot access rows from a non-nested table item