Integer Variable with value 0 is entering IF loop where varibale is checked whether it is blank or not.

Hi All,

Variable with value 0 enters the loop when checked for blank value. 

Example:-

--case 1:- when variable is checked with blank value
DECLARE @var1 INT
SET @var1=0

IF (@var1='')
BEGIN
 select @var1 'Var value is Blank'
END
ELSE
BEGIN
 select @var1 'Var value is not Blank'
END

--case 2:- when variable is checked with blank varchar value with implicit conversion 
DECLARE @var2 INT,@var4 varchar 
SET @var2=0
SET @var4=''

IF (@var2=@var4)
BEGIN
 select @var2 'Var value is Blank'
END
ELSE
BEGIN
 select @var2 'Var value is not Blank'
END

--case 3:- when variable is checked with blank varchar value with explicit conversion
DECLARE @var3 INT,@var5 varchar
SET @var3=0
SET @var5=''

IF (@var3=CAST(@var5  as int))
BEGIN
 select @var3 'Var value is Blank'
END
ELSE
BEGIN
 select @var3 'Var value is not Blank'
END

There are 3 case illustrations above in all the cases zero valued integer is getting equated to a blank value .

Is the value zero(0) and blank('') in Sql Server for an integer is same?