W3cubDocs

/MariaDB

Not Equal Operator: !=

Syntax

<>, !=

Description

Not equal operator. Evaluates both SQL expressions and returns 1 if they are not equal and 0 if they are equal, or NULL if either expression is NULL. If the expressions return different data types, (for instance, a number and a string), performs type conversion.

When used in row comparisons these two queries return the same results:

SELECT (t1.a, t1.b) != (t2.x, t2.y) 
FROM t1 INNER JOIN t2;

SELECT (t1.a != t2.x) OR (t1.b != t2.y)
FROM t1 INNER JOIN t2;

Examples

SELECT '.01' <> '0.01';
+-----------------+
| '.01' <> '0.01' |
+-----------------+
|               1 |
+-----------------+

SELECT .01 <> '0.01';
+---------------+
| .01 <> '0.01' |
+---------------+
|             0 |
+---------------+

SELECT 'zapp' <> 'zappp';
+-------------------+
| 'zapp' <> 'zappp' |
+-------------------+
|                 1 |
+-------------------+
Content reproduced on this site is the property of its respective owners, and this content is not reviewed in advance by MariaDB. The views, information and opinions expressed by this content do not necessarily represent those of MariaDB or any other party.

© 2019 MariaDB
Licensed under the Creative Commons Attribution 3.0 Unported License and the GNU Free Documentation License.
https://mariadb.com/kb/en/not-equal/