Question

嗨，我是sql世界的新手，但努力让一些基础工作。

我有一组看起来像这样的数据：

Table name: Sample
    PROJECT      WORK ORDER      AMOUNT
     -----------------------------------------
     111             a             100
     222             b             200
     111             c             300
     444             d             400
     111             e             500
     666             f             600

我希望它最终看起来像这样：

Table name: Sample
    PROJECT      WORK ORDER      AMOUNT     PROJECT AMOUNT
     --------------------------------------------------------
     111             e             500           900
     111             c             300           900
     111             a             100           900
     666             f             600           600
     444             d             400           600
     222             b             200           200

按项目总金额

排序

分组对我不起作用，因为它将所有项目分组为一个，所以我看不到“Project 111”的3个工单行

PROJECT      WORK ORDER      AMOUNT
 -----------------------------------------
 111             a             900
 222             b             200
 444             d             400
 666             f             600

排序不起作用，因为我无法根据最大的项目价值对其进行排序

Table name: Sample
    PROJECT      WORK ORDER      AMOUNT
     -----------------------------------------
     666             f             600
     111             e             500
     444             d             400
     111             c             300
     222             b             200
     111             a             100

我的另一个想法是，如果我可以创建另一个列“项目金额”，根据“项目”列中的值计算项目总数，然后我可以轻松地按项目金额对其进行排序，以达到所需的格式

Table name: Sample
    PROJECT      WORK ORDER      AMOUNT     PROJECT AMOUNT
     --------------------------------------------------------
     111             e             500           900
     111             c             300           900
     111             a             100           900
     666             f             600           600
     444             d             400           600
     222             b             200           200

但我正在努力如何获得列“项目金额”来计算所有项目的总价值，并将它们显示在出现在同一项目编号的任何行上。

有任何建议吗？

Answer 1

select  *
,       sum(amount) over (partition by project) as ProjAmount
,       row_number() over 
from    YourTable
order by
        ProjAmount desc

Example at SQL Fiddle.

要仅选择金额最高的前两个项目，您可以使用dense_rank：

select  *
from    (
        select  *
        ,       dense_rank() over (order by ProjAmount desc) as dr
        from    (
                select  *
                ,       sum(amount) over (partition by project) as ProjAmount
                from    YourTable
                ) WithProjAmount
        ) WithDenseRank
where   dr < 3
order by
        ProjAmount desc

Example at SQL Fiddle.

Answer 2

具有普通SQL子查询的版本

SELECT s.*,
       (SELECT SUM(Amount) FROM Sample WHERE Project = s.Project) ProjectAmount
  FROM Sample s
 ORDER BY ProjectAmount DESC

<强> SQLFiddle

Answer 3

SELECT  a.project ,
        a.work  ,
        a.amount ,
        b.proj_amount
FROM    project A
        JOIN ( SELECT   SUM(amount) proj_amount ,
                        project
               FROM     project
               WHERE    project = project
               GROUP BY project
             ) b ON a.project = b.project
ORDER BY proj_amount DESC ,
        amount DESC

分组和排序的问题

3 个答案: