IN operator is used to reduce use of multiple OR conditions by specifying multiple values in WHERE clause.

Syntax of IN operator in SQL –

SELECT(ColumnName(s))

FROM <TableName>

WHERE<ColumnName>

IN (value1, value2…valueN) ;   

Example of IN operator in SQL-

SELECT *

FROM Customers

WHERE City

IN (‘Berlin’,’London’,’Madrid’); 

–It will select all the customers from any of the cities Berlin, London and Mandrid.

NOT IN

Syntax of NOT IN operator in SQL –

SELECT(ColumnName(s))

FROM <TableName>

WHERE<ColumnName>

NOT IN (value1, ..…valueN) ;   

Example of NOT IN operator in SQL-

SELECT *

FROM Customers

WHERE City

NOT IN (‘Berlin’,’London’,’Madrid’); 

–It will select all the customers that are not from any of the cities Berlin, London and Mandrid.

Note-

Northwind sample database is used for example.