Store multiple values in variable

DECLARE @a INT,@b INT,@c INT=0;
DECLARE @ABC TABLE(id INT identity(1,1),stock int,month INT);
BEGIN
   INSERT INTO @ABC(Stock,month) SELECT Stock,Month FROM ABC;

    WHILE @c<=(SELECT COUNT(1) FROM @ABC)

     BEGIN
       SELECT @a=Stock,@b=month FROM @ABC WHERE ID=@c;
        if @a>@b 

         SELECT @a;
          ELSE 
         SELECT @b;

      SET @c=@c+1;
     END;
END;