If you want to query from two tables with an inner join, you can use the INNER JOIN ... ON clause in the FROM clause. The following query returns output with an inner join from two tables: employees and departments. The join condition is that the department ID in the employees table equals to the department ID in the departments table:

SQL> SELECT employees.first_name, employees.last_name,

2 departments.department_name

3 FROM employees INNER JOIN departments

4 ON employees.department_id=departments.department_id;

FIRST_NAME   LAST_NAME  DEPARTMENT_NAME

-------------------- -------------------- ---------------

Steven   King    Executive

Neena   Kochhar   Executive

Lex   De Haan   Executive

Alexander  Hunold   IT

Bruce   Ernst   IT

David   Austin   IT

Valli   Pataballa  IT

......

Note that when multiple tables are used in a query, column names need to be prefixed with table names in case the same column name is used in both tables