Query Problem... Left OuterJoin / Tagging Issue

Hi,

I've been working on this for quite awhile now and don't seem to get the
proper query.

I have basically 4 tables.

1. Table john_test contains the numbers of the calls.
2. Table john_country contains the country with prefix.
3. Table john_clients contains the clients and their sub_id's
(because a client usually has a subclient, [ex. highway-2,
highway-3]) and their prefix.
4. Table john_test contains the phone numbers.

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select * from john_client_rate limit 3;

name | country | cali | cana | callrate | dir_id | trans_id
| svc_id | base | incr | client_id
----------+----------------+------+------+----------+--------+----------+--------+------+------+-----------
highway | Afghanistan | | | 0.6212 | 0 | 0
| | 6 | 6 | 4
highway | Albania | | | 0.3945 | 0 | 1
| | 6 | 6 | 4
highway | Bahamas | | | 0.0513 | 0 | 1
| | 6 | 6 | 4
(3 rows)

select * from john_country limit 3;

country | state | prefix | area_code
---------------+-------+----------+-----------
Afghanistan | | 93 |
Aland Islands | | 35818120 |
Albania | | 355 |
(3 rows)

select * from john_clients limit 3;

id | client_id | sub_id | name | prefix | type
----+-----------+--------+----------+---------+--------
80 | 80 | 0 | highway | 71081 | client
80 | 80 | 0 | highway | 7107011 | client
80 | 80 | 0 | highway | 71091 | client
(3 rows)

select * from john_test limit 3;

client_id | name | phonenum | calledphonenum |
phonenumtranslat | direction | duration
----------+---------+----------------------+-------------------------+------------------+-----------+----------
2 | highway | 83863011351927330133 | 20100147011351927330133
| | outbound | 363
2 | highway | 83863011441179218126 | 1943011441179218126
| | outbound | 83
2 | highway | 83863011441179218126 | 20100147011441179218126
| | outbound | 32
(3 rows)

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What I want to do is to remove the prefix, and retain the number using
the following query:

select
john_test.name,
john_test.gwrxdcdn,
john_test.duration as dur,
john_client_rate.name as name2,
john_client_rate.country,
john_country.prefix,
substring(john_test.gwrxdcdn from length(john_country.prefix)+1) as strip,
get_duration(john_test.duration::int,john_client_rate.base,john_client_rate.incr)
as realdur
from john_test
left outer join john_client_rate
on (prefix in
(
select prefix from john_client_rate
where john_test.phonenum ~ ( '^' || john_country.prefix)
order by length(john_country.prefix) desc limit '1'
)
)
limit 20;

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I have achieved this already, now I want to identify which country it's
supposed to be for.
Problem is sometimes the "stripped" number that is retained shows:
8661234567 or 8889876543
This would indicate that the call is already toll free without me being
able to identify the country.
How can I get over this?

Further, I am planning to use multiple joins since I have several tables
and so as to identify missing countries. On this questions which query
is better?

Query 1:

Select table1.column,table2.column,table3.column from table1 left outer
join table 2 on (table1.column=table2.column) left outer join table3 on
(table2.column=table3.column) ;

or Query 2:

Select table1.column,table2.column,table3.column from
table1,table2,table3 where [conditions] ;

Ultimately, I want to run one query that will satisfy these things and
help me insert into a table that will have it "TAGGED" properly with the
right Country, Client(name), prefix, and Rate for computation with Duration.

Hope you can reply to me asap. This is of urgent importance. Thank you
and any help would be greatly appreciated!

- JT