Reference column without table name during table join : Table Alias « Table Joins « Oracle PL/SQL Tutorial

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Oracle PL/SQL Tutorial » Table Joins » Table Alias 
7.2.8.Reference column without table name during table join
SQL> CREATE TABLE emp
  2  (
  3     cid                NUMBER,
  4     city              VARCHAR2(30),
  5     customer_state             VARCHAR2(40),
  6     country_id                 CHAR(2)
  7  );

Table created.

SQL>
SQL> CREATE TABLE sales(
  2    product_id                NUMBER(6),
  3    cid               NUMBER,
  4    sold             NUMBER(3),
  5    amount                    NUMBER(10,2),
  6    cost                      NUMBER(10,2)
  7  );

Table created.

SQL>
SQL> select product_id, sold, city, customer_state
  2  from   sales, emp
  3  where  sales.cid = emp.cid
  4  and    product_id = 117;

no rows selected

SQL>
SQL>
SQL> drop table emp;

Table dropped.

SQL> drop table sales;

Table dropped.

SQL>
7.2.Table Alias
7.2.1.List table from two tables without indicating column owner
7.2.2.List table from two tables and specifying its column owner
7.2.3.Join tables and order by columns from different tables
7.2.4.Calculation between column from different tables
7.2.5.Join two tables and combine three tables
7.2.6.Supplying Table Aliases
7.2.7.Use * to reference all columns from a table
7.2.8.Reference column without table name during table join
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