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  • 树型数据处理

    逐级汇总示例(循环逐级累计法)–邹老大.
    Create TABLE tb(ID int PRIMARY KEY,PID int,Num int)
    Insert tb Select 1,NULL,100
    UNION ALL Select 2,1   ,200
    UNION ALL Select 3,2   ,300
    UNION ALL Select 4,3   ,400
    UNION ALL Select 5,1   ,500
    UNION ALL Select 6,NULL,600
    UNION ALL Select 7,NULL,700
    UNION ALL Select 8,7   ,800
    UNION ALL Select 9,7   ,900
    GO

    –计算的存储过程
    Create PROC p_Calc
    AS
    SET NOCOUNT ON
    DECLARE @Level int
    SET @Level=1

    Select ID,PID,SUM_Num=Num,
    Level=CASE
    WHEN EXISTS(Select * FROM tb Where PID=a.ID)
    THEN 0 ELSE 1 END
    INTO # FROM tb a

    WHILE @@ROWCOUNT>0
    BEGIN
    SET @Level=@Level+1
    Update a SET
    Level=@Level,
    SUM_Num=ISNULL(a.SUM_Num,0)+ISNULL(b.SUM_Num,0)
    FROM # a,(
    Select aa.PID,SUM_Num=SUM(aa.SUM_Num)
    FROM # aa,(Select DISTINCT PID FROM # Where Level=@Level-1)bb
    Where aa.PID=bb.PID
    AND NOT EXISTS(
    Select * FROM # Where PID=aa.PID AND Level=0)
    GROUP BY aa.PID
    )b Where a.ID=b.PID
    END
    Select a.*,b.SUM_Num
    FROM tb a,# b
    Where a.ID=b.ID
    GO

    –调用存储过程进行计算
    EXEC p_Calc
    /*–结果
    ID          PID         Num         SUM_Num
    —————- —————— ——————- ——————–
    1           NULL       100         1500
    2           1           200         900
    3           2           300         700
    4           3           400         400
    5           1           500         500
    6           NULL       600         600
    7           NULL       700         2400
    8           7           800         800
    9           7           900         900
    –*/

    逐级汇总示例(用户定义函数法) — 邹老大
    Create TABLE tb(ID int PRIMARY KEY,PID int,Num int)
    Insert tb Select 1,NULL,100
    UNION ALL Select 2,1   ,200
    UNION ALL Select 3,2   ,300
    UNION ALL Select 4,3   ,400
    UNION ALL Select 5,1   ,500
    UNION ALL Select 6,NULL,600
    UNION ALL Select 7,NULL,700
    UNION ALL Select 8,7   ,800
    UNION ALL Select 9,7   ,900
    GO

    –得到每个节点的编码累计
    Create FUNCTION f_id()
    RETURNS @t TABLE(ID int,Level int,SID varchar(8000))
    AS
    BEGIN
    DECLARE @Level int
    SET @Level=1
    Insert @t Select ID,@Level,’,'+CAST(ID as varchar)+’,’
    FROM tb
    Where PID IS NULL
    WHILE @@ROWCOUNT>0
    BEGIN
    SET @Level=@Level+1
    Insert @t Select a.ID,@Level,b.SID+CAST(a.ID as varchar)+’,’
    FROM tb a,@t b
    Where a.PID=b.ID
    AND b.Level=@Level-1
    END
    RETURN
    END
    GO

    –调用函数实现实现累计
    Select a.ID,a.PID,a.Num,SUM_Num=SUM(b.Num)
    FROM tb a,f_id() a1,
    tb b,f_id() b1
    Where a.ID=a1.ID
    AND b.ID=b1.ID
    AND b1.SID LIKE a1.SID+’%’
    GROUP BY a.ID,a.PID,a.Num
    /*–结果
    ID          PID         Num         SUM_Num
    —————- —————— ——————- ——————–
    1           NULL       100         1500
    2           1           200         900
    3           2           300         700
    4           3           400         400
    5           1           500         500
    6           NULL       600         600
    7           NULL       700         2400
    8           7           800         800
    9           7           900         900
    –*/

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  • 原文地址:https://www.cnblogs.com/Gaojier/p/2783619.html
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