Yes, NOT EQUAL exist in MySQL in the fome of <> operator. The syntax is as follows−
SELECT * FROM yourTableName WHERE yourColumnName <> yourValue;
To understand the above syntax, let us create a table. The query to create a table is as follows−
mysql> create table DoesNotEqualDemo -> ( -> Id int NOT NULL AUTO_INCREMENT, -> Name varchar(20), -> PRIMARY KEY(Id) -> ); Query OK, 0 rows affected (0.98 sec)
Insert some records in the table using insert command. The query to insert record is as follows−
mysql> insert into DoesNotEqualDemo(Name) values(NULL); Query OK, 1 row affected (0.24 sec) mysql> insert into DoesNotEqualDemo(Name) values('John'); Query OK, 1 row affected (0.18 sec) mysql> insert into DoesNotEqualDemo(Name) values('Carol'); Query OK, 1 row affected (0.43 sec) mysql> insert into DoesNotEqualDemo(Name) values('Bob'); Query OK, 1 row affected (0.13 sec) mysql> insert into DoesNotEqualDemo(Name) values(''); Query OK, 1 row affected (0.13 sec) mysql> insert into DoesNotEqualDemo(Name) values('Larry'); Query OK, 1 row affected (0.13 sec) mysql> insert into DoesNotEqualDemo(Name) values(NULL); Query OK, 1 row affected (0.10 sec)
Display all records from the table using select statement. The query is as follows−
mysql> select *from DoesNotEqualDemo;
The following is the output−
+----+-------+ | Id | Name | +----+-------+ | 1 | NULL | | 2 | John | | 3 | Carol | | 4 | Bob | | 5 | | | 6 | Larry | | 7 | NULL | +----+-------+ 7 rows in set (0.00 sec)
Here is the query to select all records which are not equal to NULL as well as empty string−
mysql> select *from DoesNotEqualDemo where Name <> 'NULL' and Name <> '';
The following is the output−
+----+-------+ | Id | Name | +----+-------+ | 2 | John | | 3 | Carol | | 4 | Bob | | 6 | Larry | +----+-------+ 4 rows in set (0.00 sec)