Oracle从多个表中选择？

Question

I have multiple Tables in Oracle which have primary keys and foreign keys linking to each other. The tables are:

Continent
Sub-Continent
Country
Region
City
Location

As example of how the layout is for each:

continent_id      | continent_name
1                 | Africa
2                 | America

sub_continent_id  | sub_continent_name  | continent_id
A1                | Southern Africa     | 1
B1                | Western Africa      | 1
A2                | North America       | 2
B2                | South America       | 2

country_id        | country_name        | sub_continent_id
CAN               | Canada              | A2
ZA                | South Africa        | A1

This continues for the rest: Region , City and Location . As can be seen, the ID's reference another table. So:

country_name "Canada" references sub_continent_id "A2" which is "North America". "North America" references continent_id 2 which is "Americas".

What I want to try and do is to run a SQL query that if I chose a location, it should return the rest of the values from other tables. So if I select a location called "Triange Building", it will automatically return:

Triangle Building, New York City, New York, North America, Americas

I am uncertain of what query to run to collect all these values each time.

I can run a single query like this to show me region name and city name, but do not know how to select more values from more Tables.

SELECT E.city_name NAME,D.region_name DNAME
FROM CITY E JOIN REGION D
ON (E.region_id = D.region_id);

Answer 1

Just join all the tables

SELECT E.city_name as NAME, D.region_name as DNAME, C.COUNTRY_NAME, SC.SUB_CONTINENT_NAME, 
       CO.CONTINENT_NAME
FROM  CITY E JOIN REGION        D  ON  E.region_id        =  D.region_id
             JOIN COUNTRY       C  ON  D.country_id       =  C.country_id
             JOIN SUB-CONTINENT SC ON  C.sub_continent_id = SC.sub_continent_id
             JOIN CONTINENT     CO ON SC.continent_id     = CO.continent_id;