使用postgres计算每月经常性收入(MRR)结果

时间:2015-03-22 06:47:20

标签: json postgresql

我需要使用postgresql json计算https://www.chargebee.com/blog/mrr-subscription-businesses-saas-metrics-101/ between selected two dates中的MRR,同时我的订阅时间间隔为"1 DAY", "15 DAY", "2 WEEK", "X WEEK", "X MONTH", "x YEAR" where x can be any number

我有以下订阅架构和值:

CREATE TABLE subscriptions
(
  id bigserial NOT NULL,
  data json,
  created_date date,
  updated_date date,
  user_id bigserial NOT NULL,
  CONSTRAINT subscription_id_pk PRIMARY KEY (id)
)

数据在列内"数据"以json格式,如:

{
  "id": "1",
  "amount": 3900,
  "interval": "1 WEEK",
  "created": 1424011935
}

并且在每个定期订阅成功时创建事务。我认为交易不是必需的,但如果你能用这种方式发展,那么也是好事。

CREATE TABLE transactions
(
  id bigserial NOT NULL,
  data json,
  created_date date,
  updated_date date,
  user_id bigserial NOT NULL,
  CONSTRAINT transactions_id_pk PRIMARY KEY (id)
)

数据在列内"数据"以json格式,如:

{
  "id": "1",
  "amount": 3900,
  "subscription_id": "1"
  "created": 1424011935

}

您可以使用表格中的数据json或created_date创建的unix时间戳,以哪个更适合您

  • 此处订阅创建日期是第一次创建的订阅,而不是每次重复订阅。
  • 我的版本是9.3

1 个答案:

答案 0 :(得分:0)

相当简单generate_series可以与INTERVAL一起使用,我们可以使用LATERAL JOIN为每个json行生成数据。

WITH j AS(
SELECT '{
  "id": "1",
  "amount": 3900,
  "interval": "1 WEEK",
  "created": 1424011935
}'::json AS data
UNION ALL
SELECT '{
  "id": "2",
  "amount": 100,
  "interval": "23.5 DAY",
  "created": 552614400
}'::json
),
dates AS(
SELECT
'2008-03-01 00:00'::timestamp AS start
,'2015-03-08 07:00'::timestamp AS stop
)
SELECT j.data->>'id'
    ,sum((j.data->>'amount')::int)
    ,count(*) as intervals
FROM j
CROSS JOIN dates
CROSS JOIN LATERAL
    (SELECT i
    FROM generate_series(to_timestamp((j.data->>'created')::int), dates.stop + (j.data->>'interval')::interval,(j.data->>'interval')::interval) as i
    WHERE i BETWEEN dates.start AND dates.stop
    ) AS q
GROUP BY j.data->>'id'

上面给出了结果:

 id |  sum  | intervals
----+-------+-----------
 1  | 11700 |         3
 2  | 11000 |       110

SQLFiddle