Re: Debet-Credit-Balance Calculation

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От Ramakrishnan Muralidharan
Тема Re: Debet-Credit-Balance Calculation
Дата
Msg-id 02767D4600E59A4487233B23AEF5C5992A407A@blrmail1.aus.pervasive.com
обсуждение исходный текст
Ответ на Debet-Credit-Balance Calculation  ("Muhyiddin A.M Hayat" <middink@indo.net.id>)
Список pgsql-sql
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Hi,

 

   Using a table with larger data in the sub-query always eats up CPU time and it is time consuming. The below given statement uses the transaction table two times in the sub-query and for processing every record, it have to go through the same table twice in the sub-query.  It is better to write a function to process the data and return back the record set.

 

Regards,

R.Muralidharan         

-----Original Message-----
From: Muhyiddin A.M Hayat [mailto:middink@indo.net.id]
Sent: Tuesday, April 19, 2005 10:18 PM
To: pgsql-sql@postgresql.org
Subject: [SQL] Debet-Credit-Balance Calculation

Dear All,

I have problem to calculation balance from debet and credit.

my transaction table:
 
 id |    trx_timestamptz     |     account      | trx_type_id |   amount
----+------------------------+------------------+-------------+-------------
  3 | 2005-04-14 17:16:49+08 | 01.2010100.00002 |           1 |  1000000.00
  4 | 2005-04-14 17:17:12+08 | 01.2010100.00002 |           1 |    50000.00
  5 | 2005-04-14 17:17:12+08 | 01.2010100.00003 |           1 |   600000.00
  6 | 2005-04-14 17:17:47+08 | 01.2010100.00002 |           2 |     7000.00
  7 | 2005-04-16 00:32:50+08 | 01.2010100.00003 |           1 |    20000.00
 11 | 2005-04-16 02:45:06+08 | 01.2010100.00002 |           1 |   100000.00
 12 | 2005-04-16 02:46:02+08 | 01.2010100.00002 |           1 |    20000.00
 13 | 2005-04-16 02:46:59+08 | 01.2010100.00002 |           2 |   163000.00
 14 | 2005-04-16 02:50:17+08 | 01.2010100.00005 |           1 |   100000.00
 15 | 2005-04-16 02:53:42+08 | 01.2010301.00001 |           1 |   100000.00
 16 | 2005-04-16 02:57:22+08 | 01.2010100.00001 |           1 |  2000000.00
 17 | 2005-04-16 23:56:44+08 | 01.2010200.00000 |           1 | 10000000.00
 18 | 2005-04-17 18:58:57+08 | 01.2010100.00003 |           1 |   100000.00
 19 | 2005-04-17 19:13:05+08 | 01.2010100.00002 |           1 |   100000.00
 20 | 2005-04-17 19:13:45+08 | 01.2010100.00002 |           1 |   200000.00
 21 | 2005-04-17 19:15:36+08 | 01.2010100.00002 |           1 |    50000.00
 22 | 2005-04-17 19:17:17+08 | 01.2010100.00005 |           2 |    10000.00
 23 | 2005-04-17 19:18:06+08 | 01.2010100.00004 |           1 |   200000.00
 24 | 2005-04-17 21:45:31+08 | 01.2010100.00002 |           1 |     9000.00
 25 | 2005-04-17 22:16:08+08 | 01.2010100.00006 |           1 |   100000.00
 
-------------------------------------------------------------------------------------------------------------------------
CREATE TABLE "public"."transactions" (
  "id" SERIAL,
  "trx_timestamptz" TIMESTAMP(0) WITH TIME ZONE DEFAULT ('now'::text)::timestamp(6) with time zone NOT NULL,
  "account" CHAR(16) NOT NULL,
  "trx_type_id" INTEGER NOT NULL,
  "amount" NUMERIC(15,2) DEFAULT 0 NOT NULL,
  "uid" INTEGER NOT NULL,
  CONSTRAINT "transactions_pkey" PRIMARY KEY("id")
) WITH OIDS;
-------------------------------------------------------------------------------------------
 
and transaction type :
 
 id | trx_name | t_type
----+----------+--------
  1 | Credit   | CR
  2 | Debet    | DB
 
---------------------------------------------------------------------
CREATE TABLE "public"."trx_type" (
  "id" SERIAL,
  "trx_name" VARCHAR(32),
  "t_type" CHAR(2),
  CONSTRAINT "trx_type_pkey" PRIMARY KEY("id"),
  CONSTRAINT "trx_typei_check0" CHECK ((t_type = 'CR'::bpchar) OR (t_type = 'DB'::bpchar))
) WITH OIDS;
 
---------------------------------------------------------------------
 
so, i'm using this query:
 
SELECT
  trans.id,
  trans.trx_timestamptz,
  trans.account,
  trans.debet,
  trans.credit
FROM
  (
    SELECT
      transactions.id,
      transactions.trx_timestamptz,
      transactions.account,
 
      CASE
        WHEN trx_type.t_type  = 'DB' THEN
          transactions.amount
        ELSE
          0
      END AS debet,
      CASE
      WHEN trx_type.t_type = 'CR' THEN
          transactions.amount
        ELSE
          0
      END AS credit
    FROM
      transactions
      INNER JOIN trx_type ON (transactions.trx_type_id = trx_type.id)
 
  ) AS trans
 
result from above query :
 
 id |    trx_timestamptz     |     account      |   debet   |   credit
----+------------------------+------------------+-----------+-------------
  3 | 2005-04-14 17:16:49+08 | 01.2010100.00002 |         0 |  1000000.00
  4 | 2005-04-14 17:17:12+08 | 01.2010100.00002 |         0 |    50000.00
  5 | 2005-04-14 17:17:12+08 | 01.2010100.00003 |         0 |   600000.00
  6 | 2005-04-14 17:17:47+08 | 01.2010100.00002 |   7000.00 |           0
  7 | 2005-04-16 00:32:50+08 | 01.2010100.00003 |         0 |    20000.00
 11 | 2005-04-16 02:45:06+08 | 01.2010100.00002 |         0 |   100000.00
 12 | 2005-04-16 02:46:02+08 | 01.2010100.00002 |         0 |    20000.00
 13 | 2005-04-16 02:46:59+08 | 01.2010100.00002 | 163000.00 |           0
 14 | 2005-04-16 02:50:17+08 | 01.2010100.00005 |         0 |   100000.00
 15 | 2005-04-16 02:53:42+08 | 01.2010301.00001 |         0 |   100000.00
 16 | 2005-04-16 02:57:22+08 | 01.2010100.00001 |         0 |  2000000.00
 17 | 2005-04-16 23:56:44+08 | 01.2010200.00000 |         0 | 10000000.00
 18 | 2005-04-17 18:58:57+08 | 01.2010100.00003 |         0 |   100000.00
 19 | 2005-04-17 19:13:05+08 | 01.2010100.00002 |         0 |   100000.00
 20 | 2005-04-17 19:13:45+08 | 01.2010100.00002 |         0 |   200000.00
 21 | 2005-04-17 19:15:36+08 | 01.2010100.00002 |         0 |    50000.00
 22 | 2005-04-17 19:17:17+08 | 01.2010100.00005 |  10000.00 |           0
 23 | 2005-04-17 19:18:06+08 | 01.2010100.00004 |         0 |   200000.00
 24 | 2005-04-17 21:45:31+08 | 01.2010100.00002 |         0 |     9000.00
 25 | 2005-04-17 22:16:08+08 | 01.2010100.00006 |         0 |   100000.00
 
 
my problem, i would like to place balance in last field. i try using this query :
 
SELECT
  trans.id,
  trans.trx_timestamptz,
  trans.account,
  trans.debet,
  trans.credit,
 

  (SELECT
      SUM(coalesce(credit,0)-coalesce(debet,0))
   FROM
  (
    SELECT
      transactions.id,
      transactions.trx_timestamptz,
      transactions.account,
 
      CASE
        WHEN trx_type.t_type  = 'DB' THEN
          transactions.amount
        ELSE
          0
      END AS debet,
      CASE
      WHEN trx_type.t_type = 'CR' THEN
          transactions.amount
        ELSE
          0
      END AS credit
    FROM
      transactions
      INNER JOIN trx_type ON (transactions.trx_type_id = trx_type.id)
 
  )  sub
   WHERE
    (sub.id <= trans.id)
    AND
    (sub.account = trans.account)
  )
  AS balance
 

FROM
  (
    SELECT
      transactions.id,
      transactions.trx_timestamptz,
      transactions.account,
 
      CASE
        WHEN trx_type.t_type  = 'DB' THEN
          transactions.amount
        ELSE
          0
      END AS debet,
      CASE
      WHEN trx_type.t_type = 'CR' THEN
          transactions.amount
        ELSE
          0
      END AS credit
    FROM
      transactions
      INNER JOIN trx_type ON (transactions.trx_type_id = trx_type.id)
 
  ) AS trans
 
-----
 
everything is ok, but when record > 1000000 that query eat all my cpu process and take a long time, i have wait for 3 mimutes but query doesn't finish. (pgsql-8.0-1 running on Dual Xeon 2.8 and 2GB of RAM)
 
can you help me how to fix them.
 
Thanks
 
 
 
 


 

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