SQL | INTERSECT Clause


The INTERSECT clause in SQL is used to combine two SELECT statements but the dataset returned by the INTERSECT statement will be the intersection of the data-sets of the two SELECT statements. In simple words, the INTERSECT statement will return only those rows which will be common to both of the SELECT statements.

Pictorial Representation:

The INTERSECT statement will return only those rows present in the red shaded region. i.e. common to both of the data-sets.

Note: The number and type of fields present in the two data-sets must be same and similar.

Syntax:

SELECT column1 , column2 ....
FROM table_names
WHERE condition

INTERSECT

SELECT column1 , column2 ....
FROM table_names
WHERE condition

Sample Tables:

Customers Table:

Orders Table:

Sample Queries:

SELECT  ID, NAME, Amount, Date
     FROM Customers
     LEFT JOIN Orders
     ON Customers.ID = Orders.Customer_id
INTERSECT
     SELECT  ID, NAME, Amount, Date
     FROM Customers
     RIGHT JOIN Orders
     ON Customers.ID = Orders.Customer_id;

Output:

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