Alias Table in SQL

Question

Hello ..
i want to join an alias Table in an SQL statment something like
Invoices_Table
-Inv_ID
-Amount
-Delevery_Country_id
-Bill_Country_id
Country_Table
-Country_id
-Country_name
I want to join Country_ID once for deleivery Country and then for Bill_Country. Which are not necessarly the same ..
How can i express it in SQL ..?
Thanx

Answer 1

Try
API> CREATE TABLE Invoices_Table
  2  (Inv_ID VARCHAR2(100),
  3  Amount VARCHAR2(100),
  4  Delevery_Country_id VARCHAR2(100),
  5  Bill_Country_id VARCHAR2(100));
Tabla creada.
Transcurrido: 00:00:00.34
API>
API> CREATE TABLE Country_Table(
  2  Country_id  VARCHAR2(100),
  3  Country_name VARCHAR2(100));
Tabla creada.
Transcurrido: 00:00:00.04
API>
API> INSERT INTO Invoices_Table VALUES('A','A','1','2');
1 fila creada.
Transcurrido: 00:00:00.04
API> INSERT INTO Country_Table VALUES('1','Country1');
1 fila creada.
Transcurrido: 00:00:00.03
API> INSERT INTO Country_Table VALUES('2','Country2');
1 fila creada.
Transcurrido: 00:00:00.03
API> COMMIT;
Validación terminada.
Transcurrido: 00:00:00.03
API> SELECT I.Inv_ID,
  2    C1.Country_name AS NAME1,
  3    C2.Country_name AS NAME1
  4  FROM Invoices_Table I, Country_Table C1, Country_Table C2
  5  WHERE I.Delevery_Country_id = C1.Country_id (+)
  6    AND I.Bill_Country_id = C2.Country_id (+);
INV_ID
NAME1
NAME1
A
Country1
Country2
Transcurrido: 00:00:00.07