SQL CTE 记录

SELECT    ID , UserName , Vcode , Fromcode ,  0 AS [count]
INTO      #heihei
FROM      dbo.RegInfo;  

DECLARE @p_id INT;
DECLARE @p_UserName VARCHAR(20);
DECLARE @p_Vcode VARCHAR(20);
DECLARE @p_Fromcode VARCHAR(20);
DECLARE @count VARCHAR(20); 

DECLARE auth_cur CURSOR
FOR
  SELECT  *
  FROM    #heihei;
OPEN auth_cur;

FETCH NEXT FROM auth_cur INTO @p_id, @p_UserName, @p_Vcode, @p_Fromcode,@count;

WHILE ( @@fetch_status = 0 )
  BEGIN
      DECLARE @vvid INT = @p_Vcode;
      DECLARE @nowcount VARCHAR(20);  

      WITH    cteTree
                AS ( SELECT   ID , Vcode , Fromcode
                     FROM     #heihei
                     WHERE    Vcode = @vvid
                     UNION ALL
                     SELECT   b.ID , b.Vcode , b.Fromcode
                     FROM     cteTree INNER JOIN #heihei b ON cteTree.Vcode = b.Fromcode
                   )
          SELECT  @nowcount = COUNT(id)
          FROM    cteTree
          WHERE   Vcode != @vvid
        --OPTION (Maxrecursion 10) ;
      UPDATE  #heihei
      SET     [count] = @nowcount
      WHERE   ID = @p_id; 

      FETCH NEXT FROM auth_cur INTO @p_id, @p_UserName, @p_Vcode, @p_Fromcode,@count;
  END;
CLOSE auth_cur;
DEALLOCATE auth_cur;

SELECT    *
FROM      #heihei;
DROP TABLE #heihei;

查询注册邀请好友的数量