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It accepts the two values, if both the values are matched then it will return NULL otherwise it will return first value. Examples-1: Declare @FisrtName varchar ( 100 ), @LastName varchar ( 100 ) Set @FisrtName = 'Rakesh' Set @LastName = 'Rakesh' Select NULLIF ( @FisrtName , @LastName ) As [NULLIF] Example-2: Declare @FisrtName varchar ( 100 ), @LastName varchar ( 100 ) Set @FisrtName = 'Rakesh' Set @LastName = 'Kalluri' Select NULLIF ( @FisrtName , @LastName ) As [NULLIF]

Simple Trick Using ISNULL: Step-1: Create Sample Student Table. CREATE TABLE Student ( Id INT IDENTITY ( 1 , 1 ) PRIMARY KEY , StudentName VARCHAR ( 100 ) NOT NULL, LivingLocation VARCHAR ( 100 ) NULL ) Step-2 :Insert Some Sample Data INSERT INTO Student SELECT 'Rakesh' , 'Hyderabad' UNION ALL SELECT 'Raju' , 'Delhi' UNION ALL SELECT 'Madhu' , 'Hyderabad' UNION ALL SELECT 'Naresh' ,NULL UNION ALL SELECT 'Venaktesh' , 'Chennai' Step-3 : Select Data from Student Table SELECT * FROM Student If we observe above data of student table we have student id 4 record LivingLocation is NULL. Step -4 :Select Data from Student Table With Where Clause. SELECT * FROM Student WHERE LivingLocation = 'Hyderabad' In the above query we are included the where clause w...