Netkiller PostgreSQL 手札

Mr. Neo Chan, 陈景峰(BG7NYT)

中国广东省深圳市龙华新区民治街道溪山美地
518131
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<netkiller@msn.com>

文档始创于2012-11-16

版权 2010, 2011, 2012, 2013 Netkiller(Neo Chan). All rights reserved.

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文档出处: http://netkiller.github.io http://netkiller.sourceforge.net

$Date: 2013-04-10 15:03:49 +0800 (Wed, 10 Apr 2013) $

我的系列文档

PostgreSQL 实用实例参考

PostgreSQL 实用实例参考 (PDF)2004-07-20

PostgreSQL 实用实例参考 (BIG5 PDF)2004-07-20

PostgreSQL 实用实例参考 (HTML)2004-07-20

PostgreSQL 实用实例参考 (BIG5 HTML)2004-07-20

5.3. 账户表/余额表/消费储蓄表

此表适用于购物车等金钱来往账面等等。

-- Table: account

-- DROP TABLE account;

CREATE TABLE account
(
  id integer NOT NULL DEFAULT nextval('trade_id_seq'::regclass),
  no character varying(10) NOT NULL, -- 账号
  balance money NOT NULL DEFAULT 0.00, -- 余额
  datetime timestamp without time zone NOT NULL DEFAULT (now())::timestamp(0) without time zone,
  CONSTRAINT account_pkey PRIMARY KEY (id)
)
WITH (
  OIDS=FALSE
);
ALTER TABLE account
  OWNER TO dba;
COMMENT ON COLUMN account.no IS '账号';
COMMENT ON COLUMN account.balance IS '余额';

-- Index: account_no_idx

-- DROP INDEX account_no_idx;

CREATE INDEX account_no_idx
  ON account
  USING btree
  (no COLLATE pg_catalog."default");

账户结余计算

select acc.*, (select sum(balance)+acc.balance from account as ac where ac.id < acc.id) as profit from account as acc;

test=# select acc.*, (select sum(balance)+acc.balance from account as ac where ac.id < acc.id) as profit from account as acc;
 id |  no  | balance  |      datetime       | profit
----+------+----------+---------------------+---------
  1 | 1000 |    $0.00 | 2013-10-09 10:51:10 |
  2 | 1000 |   $12.60 | 2013-10-09 10:51:22 |  $12.60
  4 | 1000 |   $16.80 | 2013-10-09 10:51:42 |  $29.40
  5 | 1000 |  $100.00 | 2013-10-09 10:51:49 | $129.40
  6 | 1000 |  $200.00 | 2013-10-09 10:56:35 | $329.40
  7 | 1000 |   $50.45 | 2013-10-09 10:57:23 | $379.85
  8 | 1000 |   $75.50 | 2013-10-09 10:57:31 | $455.35
  9 | 1000 |  -$55.30 | 2013-10-09 10:59:28 | $400.05
 10 | 1000 | -$200.00 | 2013-10-09 10:59:44 | $200.05
(9 rows)