IIF function in SQL Server

iif function in sql server 2012
iif function in sql server example
sql server iif function example

In this video we will discuss IIF function in SQL Server.

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IIF function
Introduced in SQL Server 2012
Returns one of two the values, depending on whether the Boolean expression evaluates to true or false
IIF is a shorthand way for writing a CASE expression

Syntax : IIF ( boolean_expression, true_value, false_value )

Example : Returns Male as the boolean expression evaluates to TRUE

SET @Gender = 1
SELECT IIF( @Gender = 1, ‘Male’, ‘Femlae’) AS Gender

Example : Using IIF() function with table data. We will use the following Employees table for this example.

SQL Script to create Employees table
Create table Employees
Id int primary key identity,
Name nvarchar(10),
GenderId int

Insert into Employees values (‘Mark’, 1)
Insert into Employees values (‘John’, 1)
Insert into Employees values (‘Amy’, 2)
Insert into Employees values (‘Ben’, 1)
Insert into Employees values (‘Sara’, 2)
Insert into Employees values (‘David’, 1)

Write a query to display Gender along with employee Name and GenderId. We can achieve this either by using CASE or IIF.

Using CASE statement
SELECT Name, GenderId,
CASE WHEN GenderId = 1
THEN ‘Male’
ELSE ‘Female’
END AS Gender
FROM Employees

Using IIF function
SELECT Name, GenderId, IIF(GenderId = 1, ‘Male’, ‘Female’) AS Gender
FROM Employees

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