EXISTS
This page is part of MariaDB's Documentation.
The parent of this page is: SQL Operators for MariaDB Enterprise Server
Topics on this page:
Overview
Presence of returned rows.
EXAMPLES
CREATE TABLE exists_example (
description VARCHAR(20),
example INT
);
CREATE TABLE exists_example_values (
val INT
);
INSERT INTO exists_example_values VALUES
(42), (99), (64);
INSERT INTO exists_example VALUES
('Everything', 42),
('Dalmations', 101),
('Agent', 99),
('B. Doz.', 13),
('CPU', 64);
SELECT * FROM exists_example AS e
WHERE EXISTS (
SELECT * FROM exists_example_values AS v
WHERE v.val = e.example
);
+-------------+---------+
| description | example |
+-------------+---------+
| Everything | 42 |
| Agent | 99 |
| CPU | 64 |
+-------------+---------+
CHANGE HISTORY
EXTERNAL REFERENCES
Additional information on this topic may be found in the MariaDB Public Knowledge Base.