Oracle:inner join between file and table - oracle

Question

I'm new to oracle and plsql, so just bear with me.
I have a file TYPES.txt,
id,name,values
1,aaa,32
2,bbb,23
3,cvv,12
4,fff,54
I also have a table in my db, PARTS.ATTRIBUTES
id,name,props,crops
1,aaa,100,zzzz
2,bbb,200,yyyy
3,cvv,300,xxxx
4,fff,400,wwww
5,sasa,343,gfgg
6,uyuy,897,hhdf
I'd like to do an INNER JOIN on the file TYPES and ATTRIBUTES based on the column name. Now, i have done this by initially loading file TYPES into a temp table and then doing INNER JOIN between the temp table and ATTRIBUTES table.
But i'd like to know whether it is possible to do INNER JOIN between TYPES file and ATTRIBUTES table without making use of a temp table.
I understand that i can load the file using and get respective rows using following script:
declare
file utl_file.file_type;
line varchar2(500);
begin
file :=utl_file.fopen('USER_DIR','TYPES.txt','r');
loop
utl_file.get_line(file ,line);
dbms_output.put_line(line);
end loop;
exception
when others then
utl_file.fclose(file);
end;
Could someone be kind enough to explain to me how i can do the join between file contents and the db table?
P.S. The file TYPES.txt is dynamically generated and can have different number of columns at different times.

Answer 1

One cleaner approach is to use an EXTERNAL TABLE.
Use a create statement like this to create TYPES_external table.
CREATE TABLE TYPES_external (
id NUMBER(5),
name VARCHAR2(50),
Values VARCHAR2(50)
)
ORGANIZATION EXTERNAL (
TYPE ORACLE_LOADER
DEFAULT DIRECTORY USER_DIR
ACCESS PARAMETERS (
RECORDS DELIMITED BY NEWLINE
FIELDS TERMINATED BY ','
MISSING FIELD VALUES ARE NULL
(
id NUMBER(5),
name VARCHAR2(50),
Values VARCHAR2(50)
)
)
LOCATION ('TYPES.txt','TYPES.txt')
)
PARALLEL 5
REJECT LIMIT UNLIMITED;
Once created , you can use this external table(TYPES_external) just as you
use any database table for select operation.