Using char varchar in sql server

Char Vs Varchar

Few example showing the difference between char and varchar:

DECLARE @CharName Char(30) = 'Yogesh Chandra Upreti',

@VarCharName VarChar(30) = 'Yogesh Chandra Upreti'

SELECT DATALENGTH(@CharName) CharSpaceUsed,DATALENGTH(@VarCharName) VarCharSpaceUsed

DECLARE @FirstName Char(20) = 'YogeshChandra',

@LastName Char(20) = 'Upreti' 

IF @FirstName + ' ' + @LastName = 'YogeshChandra Upreti' 

 PRINT 'I was Expecting'

ELSE 

 PRINT 'Surprise to me ...' 

SELECT  @FirstName + ' ' + @LastName AS Name, len(@FirstName + ' ' + @LastName) AS Length

DECLARE @FirstName VarChar(20) = 'YogeshChandra',

@LastName VarChar(20) = 'Upreti' 

IF @FirstName + ' ' + @LastName = 'YogeshChandra Upreti' 

 PRINT 'I was Expecting'

ELSE 

 PRINT 'Surprise to me ...' 

SELECT  @FirstName + ' ' + @LastName AS Name, len(@FirstName + ' ' + @LastName) AS Length