zoukankan      html  css  js  c++  java
  • 一个根据列的范围分组汇总的Sql存储过程

    1.需求说明

    有如下表数据:

    ID          NUM
    ----------- -----------
    1           2
    2           3
    3           2
    4           2
    5           12
    6           2
    7           1
    8           5
    9           1
    10          1
    11          1

    输入分组参数,比如输入 "2,5,8,10" ,实现按 ID<=2,2<ID<=5,5<ID<=8,8<ID<=10,ID>10 分组查询,要得到下面的数据:

    groupdata  num
    ---------- -----------
    id<=2      5
    2<id<=5    16
    5<id<=8    8
    8<id<=10   2
    id>10      1

    2.存储过程如下:

    --测试数据

    create table TestData(ID int,NUM int)

    insert TestData select 1,2

    union all select 2,3

    union all select 3,2

    union all select 4,2

    union all select 5,12

    union all select 6,2

    union all select 7,1

    union all select 8,5

    union all select 9,1

    union all select 10,1

    union all select 11,1

    go

     

    create proc spgroupcol

    @numlist varchar(1000)

    as

    set nocount on

    declare @t table(id int identity,groupdata varchar(10),a int,b int)

    declare @i int,@pnum varchar(10),@j int

    select @i=charindex(',',@numlist)

     ,@pnum=left(@numlist,@i-1)

    insert @t select 'id<='+@pnum,null,@pnum

     

    while @i>=1

    begin

     select @numlist=substring(@numlist,@i+1,len(@numlist)-@i)

     select @j=charindex(',',@numlist) ;  

    if @i=@j

        begin

        insert @t select @pnum+'<id<='+substring(@numlist,0,@i),@pnum,substring(@numlist,0,@i)

        select @pnum=left(@numlist,@i-1);

        end

    else

        begin

        insert @t select @pnum+'<id<='+substring(@numlist,0,@i+1),@pnum,substring(@numlist,0,@i+1)

        select @pnum=left(@numlist,@i);

        end

        select @i=charindex(',',@numlist) ;      

    end

     

    insert @t select 'id>'+@numlist,@numlist,null

    select b.groupdata,num=sum(a.num)

    from TestData a,@t b

    where case 

     when b.a is null then case when a.id<=b.b then 1 else 0 end

     when b.b is null then case when a.id>b.a then 1 else 0 end

     else case when a.id>b.a and a.id<=b.b then 1 else 0 end

     end=1

    group by b.groupdata

    order by min(b.id)

    go

     

    spgroupcol '2,5,8,10'

    drop table TestData

    sql存储过程的单步调试要在Vs2008中,服务器管理器中连接上数据库,找到存储过程右键单步调试。

  • 相关阅读:
    右值和move 与 forward
    C++11的chrono库,实现毫秒微秒级定时
    HDOJ 1176 免费馅饼(完全背包)
    HDU 1069 Monkey and Banana
    杭电 1003 Max Sum (动态规划)
    UVA ~ 514 ~ Rails (栈)
    UVA 679
    UVA11988 Broken Keyboard (a.k.a. Beiju Text)【数组模拟链表】
    Codeforces 845 C Two TVs
    codeforces 845A Chess Tourney
  • 原文地址:https://www.cnblogs.com/carysun/p/groupcolumnscope.html
Copyright © 2011-2022 走看看