Part 5 - SQL query to find employees hired in last n months

 Suggested Page:

1 - How to find nth highest salary in sql 
2 - SQL query to get organization hierarchy 
3 - How does a recursive CTE work 
4 - Delete duplicate rows in SQL 
5 - SQL query to find employees hired in last n months 
6 - Transform rows into columns in sql server 
7 - SQL query to find rows that contain only numerical data 
8 - SQL Query to find department with highest number of employees 
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This question is asked is many sql server interviews. If you have used DATEDIFF() sql server function then you already know the answer.
We will be using the following Employees table for this demo.


SQL Script to create the table and populate with test data

Create table Employees

(

     ID int primary key identity,

     FirstName nvarchar(50),

     LastName nvarchar(50),

     Gender nvarchar(50),

     Salary int,

     HireDate DateTime

)

GO

Insert into Employees values('Mark','Hastings','Male',60000,'5/10/2014')

Insert into Employees values('Steve','Pound','Male',45000,'4/20/2014')

Insert into Employees values('Ben','Hoskins','Male',70000,'4/5/2014')

Insert into Employees values('Philip','Hastings','Male',45000,'3/11/2014')

Insert into Employees values('Mary','Lambeth','Female',30000,'3/10/2014')

Insert into Employees values('Valarie','Vikings','Female',35000,'2/9/2014')

Insert into Employees values('John','Stanmore','Male',80000,'2/22/2014')

Insert into Employees values('Able','Edward','Male',5000,'1/22/2014')

Insert into Employees values('Emma','Nan','Female',5000,'1/14/2014')

Insert into Employees values('Jd','Nosin','Male',6000,'1/10/2013')

Insert into Employees values('Todd','Heir','Male',7000,'2/14/2013')

Insert into Employees values('San','Hughes','Male',7000,'3/15/2013')

Insert into Employees values('Nico','Night','Male',6500,'4/19/2013')

Insert into Employees values('Martin','Jany','Male',5500,'5/23/2013')

Insert into Employees values('Mathew','Mann','Male',4500,'6/23/2013')

Insert into Employees values('Baker','Barn','Male',3500,'7/23/2013')

Insert into Employees values('Mosin','Barn','Male',8500,'8/21/2013')

Insert into Employees values('Rachel','Aril','Female',6500,'9/14/2013')

Insert into Employees values('Pameela','Son','Female',4500,'10/14/2013')

Insert into Employees values('Thomas','Cook','Male',3500,'11/14/2013')

Insert into Employees values('Malik','Md','Male',6500,'12/14/2013')

Insert into Employees values('Josh','Anderson','Male',4900,'5/1/2014')

Insert into Employees values('Geek','Ging','Male',2600,'4/1/2014')

Insert into Employees values('Sony','Sony','Male',2900,'4/30/2014')

Insert into Employees values('Aziz','Sk','Male',3800,'3/1/2014')

Insert into Employees values('Amit','Naru','Male',3100,'3/31/2014')

Here is the SQL Query that does the job

-- Replace N with number of months

Select *

FROM Employees

Where DATEDIFF(MONTH, HireDate, GETDATE()) Between 1 and N