表中按分组记录的运行总计 [英] Running total by grouped records in table

问题描述

我有一个这样的表(Oracle，10)

I have a table like this (Oracle, 10)

Account     Bookdate     Amount
      1     20080101        100
      1     20080102        101
      2     20080102        200
      1     20080103       -200
...

我需要的是一个新表，该表按Account asc和Bookdate asc按Account顺序分组，并具有一个总计字段，例如:

What I need is new table grouped by Account order by Account asc and Bookdate asc with a running total field, like this:

Account     Bookdate     Amount     Running_total
      1     20080101        100               100
      1     20080102        101               201
      1     20080103       -200                 1
      2     20080102        200               200
...

有一种简单的方法可以做到吗?

Is there a simple way to do it?

谢谢.

推荐答案

您真的需要额外的表吗?

Do you really need the extra table?

您可以通过简单的查询获得所需的数据，如果希望数据看起来像表，则可以显然将其创建为视图.

You can get that data you need with a simple query, which you can obviously create as a view if you want it to appear like a table.

这将为您提供所需的数据:

This will get you the data you are looking for:

select 
    account, bookdate, amount, 
    sum(amount) over (partition by account order by bookdate) running_total
from t
/

这将创建一个视图以向您显示数据，就好像它是一个表一样:

This will create a view to show you the data as if it were a table:

create or replace view t2
as
select 
    account, bookdate, amount, 
    sum(amount) over (partition by account order by bookdate) running_total 
from t
/

如果您确实需要该表，是否意味着您需要对其进行不断更新?还是只剩一个?显然，如果不对，则可以使用上面的查询按选择创建表".

If you really need the table, do you mean that you need it constantly updated? or just a one off? Obviously if it's a one off you can just "create table as select" using the above query.

我使用的测试数据是:

create table t(account number, bookdate date, amount number);

insert into t(account, bookdate, amount) values (1, to_date('20080101', 'yyyymmdd'), 100);

insert into t(account, bookdate, amount) values (1, to_date('20080102', 'yyyymmdd'), 101);

insert into t(account, bookdate, amount) values (1, to_date('20080103', 'yyyymmdd'), -200);

insert into t(account, bookdate, amount) values (2, to_date('20080102', 'yyyymmdd'), 200);

commit;

忘记添加；您指定要对表进行排序-这确实没有意义，并且让我认为您的意思确实是您想要查询/视图-排序是执行查询的结果，而不是查询中固有的内容该表(忽略索引组织表等).

forgot to add; you specified that you wanted the table to be ordered - this doesn't really make sense, and makes me think that you really mean that you wanted the query/view - ordering is a result of the query you execute, not something that's inherant in the table (ignoring Index Organised Tables and the like).

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