Oracle INTERSECT Operator

In Oracle, INTERSECT Operator is used to return the results of 2 or more SELECT statement. It picks the common or intersecting records from compound SELECT queries.

Syntax

  SELECT expression1, expression2, ... expression_n  

FROM table1  

WHERE conditions  

INTERSECT  

SELECT expression1, expression2, ... expression_n  

FROM table2  

WHERE conditions;  

Parameters

1) expression1, expression2, … expression_n: It specifies the columns that you want to retrieve.

2) table1, table2: It specifies the tables that you want to retrieve records from.

3) conditions: it specifies the conditions that must be fulfilled for the records to be selected.

Oracle INTERSECT Example: (with single expression)

Suppliers Table

Suppliers Data

Order_details Table

Order_details Data

SELECT supplier_id  

FROM suppliers  

INTERSECT  

SELECT supplier_id  

FROM order_details;

In the above example, the supplier_id appears in both the suppliers and order_details table. Now the common entries will be returned in the result set.

Output

Oracle INTERSECT Example: (with multiple expressions)

Supplier Table

Supplier Data

Customer Table

Customer Data

  SELECT supplier_id, last_name, first_name  

FROM supplier  

WHERE first_name <> 'dhirubhai'  

INTERSECT  

SELECT customer_id, last_name, first_name  

FROM customer  

WHERE customer_id < 5;  

Output

The above example returns the records from the supplier table where the supplier_id, last_name and first_name values match the customer_id, last_name, and first_name value of customer table.