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MySQL EXISTS Operator

The MySQL EXISTS Operator

The EXISTS operator is used to test for the existence of any record in a subquery.

The EXISTS operator returns TRUE if the subquery returns one or more records.

EXISTS Syntax

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

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

2

Chang

1

1

24 - 12 oz bottles

19

3

Aniseed Syrup

1

2

12 - 550 ml bottles

10

4

Chef Anton's Cajun Seasoning

2

2

48 - 6 oz jars

22

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

MySQL EXISTS Examples

The following SQL statement returns TRUE and lists the suppliers with a product price less than 20:

Example

SELECT SupplierName
FROM Suppliers
WHERE EXISTS (SELECT ProductName FROM Products WHERE Products.SupplierID = Suppliers.supplierID AND Price < 20);

-

The following SQL statement returns TRUE and lists the suppliers with a product price equal to 22:

Example

SELECT SupplierName
FROM Suppliers
WHERE EXISTS (SELECT ProductName FROM Products WHERE Products.SupplierID = Suppliers.supplierID AND Price = 22);

-

 

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