(IN) operator in sql like "OR" operator

For example: 

Select * From employees

Where department_id "IN" (60,90); 

​

Used alongside a WHERE clause as a shorthand for multiple OR conditions.

So instead of:

SELECT * FROM users

WHERE country = 'USA' OR country = 'United Kingdom' OR

country = 'Russia' OR country = 'Australia';

You can use:

SELECT * FROM users

WHERE country IN ('USA', 'United Kingdom', 'Russia',

'Australia');

-- IN is a shortcut of OR for a list of values that exist in same column

​

SELECT col1, col2

FROM table_name

WHERE col2 = 'A' AND (col1 = 1920 OR col1 = 1930 OR col1 = 1940);

​

-- Now since col1 has multiple values with OR, we can replace these OR with IN

SELECT col1, col2

FROM table_name

WHERE col2 = 'A' AND col1 IN (1920, 1930, 1940);

SELECT EmpId FROM EmployeeDetails

UNION 

SELECT EmpId FROM EmployeeSalary;

​

SELECT EmpId,

Salary+Variable as TotalSalary 

FROM EmployeeSalary;

​

SELECT first_name, country

FROM Customers

WHERE country IN ('USA', 'UK');

(IN) operator in sql like "OR" operator

For example: 

Select * From employees

Where department_id "IN" (60,90); 

​

SELECT FullName

FROM EmployeeDetails

WHERE FullName LIKE ‘__hn%’;

​