SQL EXISTS Operator

The SQL EXISTS Operator

The EXISTS operator is used in a WHERE clause to check whether a subquery returns any rows.

The EXISTS operator evaluates to TRUE if the subquery returns at least one row, and FALSE otherwise.

EXISTS Syntax

SELECT column_name(s)
FROM table_name
WHERE EXISTS (subquery);

Demo Database

Below is a selection from the "Products" table in the Northwind sample database:

ProductID	ProductName	SupplierID	CategoryID	Unit	Price
1	Chais	1	1	10 boxes x 20 bags	18.00
2	Chang	1	1	24 - 12 oz bottles	19.00
3	Aniseed Syrup	1	2	12 - 550 ml bottles	10.00
4	Chef Anton's Cajun Seasoning	2	2	48 - 6 oz jars	22.00
5	Chef Anton's Gumbo Mix	2	2	36 boxes	21.35

And a selection from the "Suppliers" table:

SupplierID	SupplierName	ContactName	Address	City	PostalCode	Country
1	Exotic Liquid	Charlotte Cooper	49 Gilbert St.	London	EC1 4SD	UK
2	New Orleans Cajun Delights	Shelley Burke	P.O. Box 78934	New Orleans	70117	USA
3	Grandma Kelly's Homestead	Regina Murphy	707 Oxford Rd.	Ann Arbor	48104	USA
4	Tokyo Traders	Yoshi Nagase	9-8 Sekimai Musashino-shi	Tokyo	100	Japan

SQL EXISTS Examples

The following SQL checks if any suppliers has a product with a price lower than 10. If the subquery evaluates to TRUE; list the suppliers with a product price less than 10:

Example

SELECT SupplierName
FROM Suppliers
WHERE EXISTS (
SELECT ProductName
FROM Products
WHERE Products.SupplierID = Suppliers.supplierID AND Price < 10
);

Try it Yourself »

The following SQL checks if any suppliers has a product with a price equal to 22. If the subquery evaluates to TRUE; list the suppliers with a product price equal to 22: