intersection, Difference set and ____oracle of Oracle multiple query results

Union/union All operation: Combines the query's return into one result, and union all does not filter the duplicates.

Select product_id from Order_items
UNION
select product_id from inventories;

Select location_id from  locations 
UNION All 
select location_id from  departments;

Intersect operation: Returns the same part of the query result.

Select product_id from inventories
INTERSECT
select product_id from Order_items;

Minus operation: Returns the portion of the row that is not the same as the second query result in the first query result.

Select product_id from inventories
minus
select product_id from Order_items;