NOT condition is used to fetch the rows that are not satisfy the specified condition in WHERE clause. NOT condition is used in the SELECT, UPDATE, DELETE statements.

SELECT column1, column2, …, columnN
  FROM table_name
  WHERE NOT condition; 

• column1, column2, …, columnN – Specifies the column names that are used to fetch from table.
• table_name – Specifies the name of the table.
• condition – Specifies the condition that is with WHERE clause.

Let us consider the employee_details table as follows -

Scenario – Fetch rows that are not satisfy the specified condition.

Requirement1 – Fetch employee details whose dept_id is not 1000. The query was as follows –

SELECT * FROM employee_details WHERE NOT dept_id = 1000; 

By executing above query, we can get results as shown below –

Requirement2 – Fetch employees details whose salary not 15000 or 25000. The query was as follows –

SELECT * FROM employee_details WHERE  NOT salary IN (15000, 25000); 

By executing above query, we can get results as shown below –

Requirement3 – Fetch all details of employees whose emp_id is in between 004 and 007. The query was as follows –

SELECT * FROM employee_details WHERE  emp_id NOT BETWEEN 004 AND 007; 

By executing above query, we can get results as shown below –

Requirement4 – Fetch all details of employees whose designation is not start with "man". The query was as follows –

SELECT * FROM employee_details WHERE designation NOT LIKE "man%"; 

By executing above query, we can get results as shown below –

Requirement5 – Fetch all details of employees whose manager_id is not NULL. The query was as follows –

SELECT * FROM employee_details WHERE  manager_id IS NOT NULL; 

By executing above query, we can get results as shown below –

Scenario – Updating the rows by using NOT condition.

Requirement – Update the employee salary as 20000 whose designations are not "Director" or 'Manager". The query was as follows –

UPDATE employee_details 
SET salary = 17000
WHERE designation NOT IN ("Director", "Manager"); 

By executing above query, we can update salary with 20000. The updated table is as follows –

Scenario – Delete the rows using NOT condition.

Requirement - Delete employee details whose joining date not in "2019-07-11", "2019-10-08". The query was as follows –

  DELETE FROM employee_details WHERE date_of_hire NOT IN 
("2019-07-11", "2019-10-08"); 

By executing above query, we can delete the satisfied rows from employee_details table. The updated table is as follows –