Correlated sub-query/outer join problem

Question

Hi,
I have a problem similar to this one (Outer join with correlated subquery but I'm struggling to find a solution for mine!
The following query works OK unless there is no entry in room_prices, so I need to outer join somehow to that table otherwise it doesn't return any rows.
The main difference between the query in the other thread and mine is that mine has an extra table (bookings b) in the sub-query, which is complicating things a bit.
select b.book_from,
     b.book_to,
     b.flat_rate,
     nvl(c.discount,0),
     p.hourly,
     p.half_day,
     p.daily,
     p.discountable,
     p.surcharge,
     l.evening_start,
     nvl(b.full_day,'N')
from booking.bookings b,
booking.customer c,
booking.room_prices p,
booking.rooms r,
booking.location l
where b.id = 9272
and c.id = b.customer
and b.room = p.room
and b.room = r.id
and r.loc = l.id
and p.from_date =
select max(p2.from_date)
from booking.room_prices p2
where p2.room = p.room
and p2.from_date < b.book_from
Could anyone suggest a way to re-write the query so that it is outer joined to room_prices?
Thanks,
Hazel

Answer 1

Thanks for both of your responses.
Unfortunately your suggestion didn't work Dmytro - still no rows are returned.
Here are some table creation scripts and test data to insert:
CREATE TABLE BOOKINGS
ID NUMBER NOT NULL,
ROOM NUMBER NOT NULL,
CUSTOMER NUMBER NOT NULL,
BOOK_FROM DATE NOT NULL,
BOOK_TO DATE NOT NULL,
CONFIG VARCHAR2(24) NOT NULL,
CREATED_DATE DATE NOT NULL,
CREATED_BY VARCHAR2(16) NOT NULL,
UPDATED_DATE DATE,
UPDATED_BY VARCHAR2(16),
DELEGATES NUMBER,
NARRATIVE VARCHAR2(256),
CONTACT_DETAILS VARCHAR2(400),
CONFIRMED VARCHAR2(1),
CANC_REASON NUMBER,
FULL_DAY VARCHAR2(1),
FLAT_RATE NUMBER,
STANDBY NUMBER,
TOTAL_STANDBY_TIME DATE,
PRE_STANDBY_TIME DATE,
PRE_STANDBY NUMBER,
GL_CODE VARCHAR2(20)
CREATE TABLE CUSTOMER
ID NUMBER NOT NULL,
CUSTOMER VARCHAR2(160) NOT NULL,
CONTACT_ADDRESS VARCHAR2(240),
CONTACT_TELEPHONE VARCHAR2(20),
CONTACT_EMAIL VARCHAR2(160),
CREATED_DATE DATE NOT NULL,
CREATED_BY VARCHAR2(16) NOT NULL,
UPDATED_DATE DATE,
UPDATED_BY VARCHAR2(16),
DISCOUNT NUMBER(5,2),
CUST_TYPE VARCHAR2(1),
CONTACT_FAX VARCHAR2(20),
DEBTOR_NO VARCHAR2(20),
BC_CONTACT VARCHAR2(64)
CREATE TABLE ROOMS
ID NUMBER NOT NULL,
LOC NUMBER NOT NULL,
NAME VARCHAR2(160) NOT NULL,
CREATED_DATE DATE NOT NULL,
CREATED_BY VARCHAR2(16) NOT NULL,
UPDATED_DATE DATE,
UPDATED_BY VARCHAR2(16),
ACTIVE VARCHAR2(1),
ROOM_DESC VARCHAR2(2000)
CREATE TABLE LOCATION
ID NUMBER NOT NULL,
NAME VARCHAR2(240) NOT NULL,
ADDRESS VARCHAR2(240),
PCODE VARCHAR2(8),
CREATED_DATE DATE NOT NULL,
CREATED_BY VARCHAR2(16) NOT NULL,
UPDATED_DATE DATE,
UPDATED_BY VARCHAR2(16),
CONF_RDF VARCHAR2(10),
CLOSING VARCHAR2(5),
EVENING_START VARCHAR2(5)
CREATE TABLE ROOM_PRICES
ROOM NUMBER NOT NULL,
FROM_DATE DATE NOT NULL,
HOURLY NUMBER(6,2),
HALF_DAY NUMBER(6,2),
DAILY NUMBER(6,2),
DISCOUNTABLE VARCHAR2(1),
CREATED_DATE DATE NOT NULL,
CREATED_BY VARCHAR2(16) NOT NULL,
UPDATED_DATE DATE,
UPDATED_BY VARCHAR2(16),
SURCHARGE NUMBER(6,2)
Insert into bookings
(ID, ROOM, CUSTOMER, BOOK_FROM, BOOK_TO, CONFIG, CREATED_DATE, CREATED_BY, UPDATED_DATE, UPDATED_BY, DELEGATES, NARRATIVE, CONTACT_DETAILS, CONFIRMED, FLAT_RATE, PRE_STANDBY_TIME, PRE_STANDBY)
Values
(9272, 7466, 4946, TO_DATE('10/25/2005 10:00:00', 'MM/DD/YYYY HH24:MI:SS'), TO_DATE('10/25/2005 13:00:00', 'MM/DD/YYYY HH24:MI:SS'), 'Default', TO_DATE('10/27/2005 15:35:02', 'MM/DD/YYYY HH24:MI:SS'), 'HSIS0201', TO_DATE('10/27/2005 15:36:26', 'MM/DD/YYYY HH24:MI:SS'), 'HSIS0201', 1, 'another meeting', 'Hazel', 'Y', 40, TO_DATE('10/25/2005 09:30:00', 'MM/DD/YYYY HH24:MI:SS'), 1800);
Insert into customer
(ID, CUSTOMER, CONTACT_ADDRESS, CONTACT_TELEPHONE, CREATED_DATE, CREATED_BY, CUST_TYPE, BC_CONTACT)
Values
(4946, 'Association of Teachers', 'Address', '0191 8887777', TO_DATE('09/22/2003 08:05:47', 'MM/DD/YYYY HH24:MI:SS'), 'Dataload', 'B', 'Miss Jones');
Insert into rooms
(ID, LOC, NAME, CREATED_DATE, CREATED_BY, UPDATED_DATE, UPDATED_BY, ACTIVE)
Values
(7466, 308, ' Counselling Room 1', TO_DATE('04/11/2005 10:55:33', 'MM/DD/YYYY HH24:MI:SS'), 'BJAC1906', TO_DATE('06/22/2005 14:43:50', 'MM/DD/YYYY HH24:MI:SS'), 'HSIS0201', 'Y');
Insert into location
(ID, NAME, ADDRESS, PCODE, CREATED_DATE, CREATED_BY, UPDATED_DATE, UPDATED_BY, CONF_RDF, CLOSING, EVENING_START)
Values
(308, 'Business Centre', 'Address', 'NE30 1NT', TO_DATE('03/19/2003 13:07:35', 'MM/DD/YYYY HH24:MI:SS'), 'BJAC1906', TO_DATE('06/09/2005 11:17:09', 'MM/DD/YYYY HH24:MI:SS'), 'BJAC1906', 'BKCF_2', '22:30', '18:00');
Thanks,
Hazel