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MySQL not equal to (<>, !=) operator

not equal to (<>, !=) operator

MySQL Not equal is used to return a set of rows (from a table) after making sure that two expressions placed on either side of the NOT EQUAL TO (<>) operator are not equal.

Syntax:

<>, !=

MySQL Version: 8.0

Example: MySQL not equal to (<>) operator

The following MySQL statement will fetch the rows from the table publisher which contain publishers those who don't belong to the country USA.

Code:

SELECT pub_name,country,pub_city,estd 
FROM publisher 
WHERE country <>"USA";

Relational Algebra Expression:

Relational Algebra Expression: MySQL not equal to operator.

Relational Algebra Tree:

Relational Algebra Tree: MySQL not equal to operator.

Sample table: publisher


Output:

example mysql not equal to
mysql> SELECT pub_name,country,pub_city,estd 
    -> FROM publisher 
    -> WHERE country <>"USA";
+------------------------------+-----------+-----------+------------+
| pub_name                     | country   | pub_city  | estd       |
+------------------------------+-----------+-----------+------------+
| BPP Publication              | India     | Mumbai    | 1985-10-01 | 
| New Harrold Publication      | Australia | Adelaide  | 1975-09-05 | 
| Ultra Press Inc.             | UK        | London    | 1948-07-10 | 
| Pieterson Grp. of Publishers | UK        | Cambridge | 1950-07-15 | 
| Novel Publisher Ltd.         | India     | New Delhi | 2000-01-01 | 
+------------------------------+-----------+-----------+------------+
5 rows in set (0.00 sec)

Example : MySQL not equal to (!=) operator with AND using IN operator

The following MySQL statement will fetch the rows from the table book_mast which contain books not written in English and the price of the books are 100 or 200.

Code:

SELECT book_name,dt_of_pub,pub_lang,no_page,book_price
FROM book_mast
WHERE pub_lang!="English" AND book_price IN(100,200);

Sample table: book_mast


Output:

mysql> SELECT book_name,dt_of_pub,pub_lang,no_page,book_price
    -> FROM book_mast
    -> WHERE pub_lang!="English" AND book_price IN(100,200);
+----------------------------------+------------+----------+---------+------------+
| book_name                        | dt_of_pub  | pub_lang | no_page | book_price |
+----------------------------------+------------+----------+---------+------------+
| Guide to Networking              | 2002-09-10 | Hindi    |     510 |     200.00 | 
| Environment a Sustainable Future | 2003-10-27 | German   |     165 |     100.00 | 
+----------------------------------+------------+----------+---------+------------+
2 rows in set (0.00 sec)

Example : MySQL not equal to ( !=) operator

This following MySQL statement will fetch the rows from the table book_mast which contain books not written in English and the price of the books are less than 100 or more than 200.

Code:

SELECT book_name,dt_of_pub,pub_lang,no_page,book_price
FROM book_mast
WHERE pub_lang!="English" AND book_price NOT BETWEEN 100 AND 200;

Sample table: book_mast


Output:

mysql> SELECT book_name,dt_of_pub,pub_lang,no_page,book_price
    -> FROM book_mast
    -> WHERE pub_lang!="English" AND book_price NOT BETWEEN 100 AND 200;
+----------------------------------+------------+----------+---------+------------+
| book_name                        | dt_of_pub  | pub_lang | no_page | book_price |
+----------------------------------+------------+----------+---------+------------+
| Advanced 3d Graphics             | 2004-02-16 | Hindi    |     165 |      56.00 | 
| Human Anatomy                    | 2001-05-17 | German   |      88 |      50.50 | 
| The Experimental Analysis of Cat | 2007-06-09 | French   |     225 |      95.00 | 
| Networks and Telecommunications  | 2002-01-01 | French   |      95 |      45.00 | 
+----------------------------------+------------+----------+---------+------------+
4 rows in set (0.00 sec)

Slideshow of MySQL Comparison Function and Operators

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Next: NOT IN()



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