009 SQL NOT

#Edu #SQL

The current webpage explains the SQL NOT operator, which is used to reverse the result of a condition in SQL queries—it returns records that do not match the specified condition.

Key points from the page:

The NOT operator is commonly combined with other operators (like =, LIKE, BETWEEN, IN, comparison operators) to select records that do not meet certain criteria.
Example usages include:
- NOT = 'Spain': Selects customers not from Spain.
- NOT LIKE 'A%': Selects customers whose names do not start with 'A'.
- NOT BETWEEN 10 AND 60: Selects customers with IDs not between 10 and 60.
- NOT IN ('Paris', 'London'): Selects customers not from Paris or London.
- NOT CustomerID > 50: Selects customers whose ID is not greater than 50.
- NOT CustomerId < 50: Selects customers whose ID is not less than 50.

Sample code for 'NOT Less Than':

SELECT * FROM Customers
WHERE NOT CustomerId < 50;

This query returns all customers with a CustomerID not less than 50, meaning CustomerID >= 50.[1]

The page also offers syntax, more examples, links to try out code, and a quiz question about the operator’s purpose.

SQL NOT Operator

The NOT Operator

The NOT operator is used in combination with other operators to give the opposite result, also called the negative result.

In the select statement below we want to return all customers that are NOT from Spain:

Select only the customers that are NOT from Spain:

SELECT * FROM Customers  
WHERE NOT Country = 'Spain';

In the example above, the NOT operator is used in combination with the = operator, but it can be used in combination with other comparison and/or logical operators. See examples below.

Syntax

SELECT column1, column2, ...
FROM table_name
WHERE NOT condition;

Demo Database

Below is a selection from the Customers table used in the examples:

CustomerID	CustomerName	ContactName	Address	City	PostalCode	Country
1	Alfreds Futterkiste	Maria Anders	Obere Str. 57	Berlin	12209	Germany
2	Ana Trujillo Emparedados y helados	Ana Trujillo	Avda. de la Constitución 2222	México D.F.	05021	Mexico
3	Antonio Moreno Taquería	Antonio Moreno	Mataderos 2312	México D.F.	05023	Mexico
4	Around the Horn	Thomas Hardy	120 Hanover Sq.	London	WA1 1DP	UK
5	Berglunds snabbköp	Christina Berglund	Berguvsvägen 8	Luleå	S-958 22	Sweden

NOT LIKE

Select customers that does not start with the letter 'A':

SELECT * FROM Customers
WHERE CustomerName NOT LIKE 'A%';

NOT BETWEEN

Select customers with a customerID not between 10 and 60:

SELECT * FROM Customers
WHERE CustomerID NOT BETWEEN 10 AND 60;

NOT IN

Select customers that are not from Paris or London:

SELECT * FROM Customers
WHERE City NOT IN ('Paris', 'London');

NOT Greater Than

Select customers with a CustomerId not greater than 50:

SELECT * FROM Customers
WHERE NOT CustomerID > 50;

NOT Less Than

Select customers with a CustomerID not less than 50:

SELECT * FROM Customers
WHERE NOT CustomerId < 50;