Variables scope which are defined within a while block in stored procedures - SQl Server

Question

I\'ve come across a interesting scenario (at least for me) in a stored procedure. Would like to have experts opinion and thoughts on it.

DECLARE @loopcounter         


        

Answer 1

Try this for fun

if 1 = 0
begin
  -- will never happen
  declare @xx int
end  
else  
begin
  set @xx = 1
end  
print @xx

Apparently the declare code does not have to be executed. Only be declared before it is used.

This don't work

if 1 = 0
begin
  -- will never happen
  set @xx = 1
end  
else  
begin
  declare @xx int
end  
print @xx

Answer 2

DECLARE @loopcounter INT
SET @loopcounter=10

WHILE @loopcounter > 0
BEGIN
  DECLARE @insidevalue int
  IF (@loopcounter%2 = 0)
  begin

    set @insidevalue=@loopcounter
    PRINT 'Value_' + CAST(@insidevalue AS NVARCHAR) + '_'
  end
  ELSE

    PRINT 'Value_' + ' ' + '_'
    SET @loopcounter = @loopcounter - 1
END