How do I return the results of two SELECT statements in to one result?

Question

I want to do this without using UNION.
Here's an example of what I'm trying to do:
I have a table called COUNTRY with the following columns:
COUNTRY
COUNTRY_CODE
DATE_VISITED_LAST
POPULATIONI have another table called STATE_COUNTY with the following columns:
STATE_COUNTY
COUNTRY_CODE
STATE_COUNTY_CODE
DATE_LAST_VISITED
POPULATIONI have a third table called TOWN with the following columns:
TOWN
COUNTRY_CODE
STATE_COUNTY_CODE
TOWN_CODE
DATE_LAST_VISITED
POPULATIONNow through the interface I have, a user will supply a country code. I need a SELECT statement that will return a table with the following result set:
The COUNTRY_CODE entered including the DATE_LAST_VISITED and POPULATION for this country
------> All the associated STATE_COUNTY's belonging to this country along with the DATE_LAST_VISITED and POPULATION for each STATE_COUNTY_CODE.
-------------> All the associated TOWN_CODE's belonging to this state_county and country along with the DATE_LAST_VISITED and population for each TOWN.
So the table will have 9 columns:
COUNTRY
DATE_LAST_VISITED_COUNTRY
POPULATION_COUNTRY
STATE_COUNTY
DATE_LAST_VISITED_STATE_COUNTY
POPULATION_COUNTY
TOWN
DATE_LAST_VISITED_TOWN
POPULATION_TOWNAny ideas how this can be done?
Thanks.

Answer 1

Hi guys,
Would it be ok to do it like this (with a join):
SELECT      
     c.country_code,
     c.date_last_visited AS DATE_LAST_VISITED_COUNTRY,
     c.population AS POPULATION_COUNTRY,
     s.state_county_code,
     s.date_last_visited AS DATE_LAST_VISITED_STATE_COUNTY,
     s.population AS POPULATION_COUNTY,
     t.town_code,
     t.date_last_visited AS DATE_LAST_VISITED_TOWN,
     t.population POPULATION_TOWN,
FROM
     country c
     LEFT OUTER JOIN state_county s ON s.country_code = c.country_code
     LEFT OUTER JOIN town       t ON t.country_code = s.country_code
AND                                       t.state_county_code = s.state_county_codeThe results required would be something like:
Country_Code     DATE_LAST_VISITED_COUNTRY     POPULATION_COUNTRY     STATE_COUNTY_CODE         DATE_LAST_VISITED_STATE_COUNTY         POPULATION_COUNTY     TOWN_CODE     DATE_LAST_VISITED_TOWN     POPULATION_TOWN
UK               14-JAN-09                     56,00000               London                    18-JUL-99                              23,0000               Ascot         30-JUN-89                  12,000
                                                                                                                                                             Brixton       28-JAN-92                  4,684
                                                                      Birmingham                12-SEP-09                              55,678                Solihull      12-OCT-81                  6.768 Does this make sense?
Thanks!
Edited by: Sastry on Nov 2, 2009 2:04 AM