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這篇文章主要介紹了PostgreSQL完成按月累加的操作，具有很好的參考價值，希望對大家有所幫助。一起跟隨小編過來看看吧。

背景

統計某個指標，指標按照月進行累加，注意需要按省份和年份進行分組。

方法一、使用自關聯

-- with 按月統計得到中間結果
WITH yms AS (SELECT regionid,SUM(getnum) AS getnum,SUM(dealnum) AS dealnum,to_char(qndate,'yyyy-MM') AS yearmonth
FROM t_queuenumber
GROUP BY regionid,to_char(qndate,'yyyy-MM')
ORDER BY regionid,yearmonth)-- 查用子查詢解決。
SELECT s1.regionid,s1.yearmonth, getnum,dealnum,
(SELECT SUM(getnum) FROM yms s2 WHERE s2.regionid = s1.regionid AND s2.yearmonth <= s1.yearmonth AND SUBSTRING(s1.yearmonth,0,5) = SUBSTRING(s2.yearmonth,0,5) ) AS getaccumulatednum,
(SELECT SUM(dealnum) FROM yms s2 WHERE s2.regionid = s1.regionid AND s2.yearmonth <= s1.yearmonth AND SUBSTRING(s1.yearmonth,0,5) = SUBSTRING(s2.yearmonth,0,5) ) AS accumulatednum
FROM yms s1;

查詢的結果如下：

方法二、使用窗口函數

更多關于窗口函數的用法，可以參考以前的文章。窗口函數十分適合這樣的場景：

 WITH yms AS (SELECT regionid,SUM(getnum) AS getnum,SUM(dealnum) AS dealnum,to_char(qndate,'yyyy-MM') AS yearmonth
 FROM t_queuenumber
 GROUP BY regionid,to_char(qndate,'yyyy-MM')
 ORDER BY regionid,yearmonth)
 -- 窗口函數的使用
 SELECT regionid,yearmonth,
 SUM(getnum) OVER(PARTITION BY regionid,SUBSTRING(yearmonth,0,5) ORDER BY yearmonth) AS getaccumulatednum,
 SUM(dealnum) OVER(PARTITION BY regionid ,SUBSTRING(yearmonth,0,5) ORDER BY yearmonth) AS dealaccumulatednum
 FROM yms;

后記

可以使用子查詢、可以使用窗口函數完成上面業務場景。

補充：PostgreSQL實現按秒按分按時按日按周按月按年統計數據

提取時間（年月日時分秒）：

import datetime
from dateutil.relativedelta import relativedelta
today = str(datetime.datetime.now())
print(today)
print(today[:4], today[:7], today[:10],today[:13])
 
print("************分隔符***************")
 
yesterday = (datetime.datetime.now() + datetime.timedelta(days=-1)).strftime("%Y-%m-%d %H:%M:%S")
yesterday2 = (datetime.datetime.now() + datetime.timedelta(days=-2)).strftime("%Y-%m-%d %H:%M:%S")
nextmonths = str(datetime.date.today() - relativedelta(months=-1))[:7]
lastmonths = str(datetime.date.today() - relativedelta(months=+1))[:7]
lastyears = str(datetime.date.today() - relativedelta(years=+1))[:4]
nextyears = str(datetime.date.today() - relativedelta(years=-1))[:4]
 
print(yesterday)
print(yesterday2)
print(nextmonths)
print(lastmonths)
print(lastyears)
print(nextyears)

結果：

2020-03-05 13:49:59.982555
2020 2020-03 2020-03-05 2020-03-05 13
************分隔符***************
2020-03-04 13:49:59
2020-03-03 13:49:59
2020-04
2020-02
2019
2021

昨日每時：

select s.acceptDate, s.data_num
 from (select to_char(acceptDate, 'yyyy-mm-dd hh24') || '點' as acceptDate,
        count(1) as data_num
     from table_name t
     where t.acceptDate >= to_date('20190506', 'yyyymmdd')
      and t.acceptDate < to_date('20190507', 'yyyymmdd') and organization_ = 'abcdefghijklmnopqrstuvwxyz'
     group by to_char(acceptDate, 'yyyy-mm-dd hh24') || '點') s

本月每天：

select s.acceptDate, s.data_num
 from (select to_char(acceptDate, 'yyyy-mm-dd') as acceptDate,
        count(1) as data_num
     from table_name t
     where t.acceptDate >= to_date('201905', 'yyyymm')
      and t.acceptDate < to_date('201906', 'yyyymm') and organization_ = 'abcdefghijklmnopqrstuvwxyz'
     group by to_char(acceptDate, 'yyyy-mm-dd') ) s

本年每月：

select s.acceptDate, s.data_num
 from (select to_char(acceptDate, 'yyyy-mm') as acceptDate,
        count(1) as data_num
     from table_name t
     where t.acceptDate >= to_date('2019', 'yyyy')
      and t.acceptDate < to_date('2020', 'yyyy') and organization_ = 'abcdefghijklmnopqrstuvwxyz'
     group by to_char(acceptDate, 'yyyy-mm') ) s

2月-7月中每月的人數統計：

sql = """SELECT to_char(rujiaoriqi, 'yyyy-mm') as month,count(1) num
           FROM jibenxx where rujiaoriqi is not null and zhongzhiriqi is null
           AND to_char(rujiaoriqi,'yyyy-mm-dd')>='2020-02-01'
           GROUP BY to_char(rujiaoriqi, 'yyyy-mm') order by to_char(rujiaoriqi, 'yyyy-mm') """

統計每年：

select s.acceptDate, s.data_num
 from (select to_char(acceptDate, 'yyyy') as acceptDate,
        count(1) as data_num
     from table_name t
     where t.acceptDate >= to_date('2015', 'yyyy')
      and t.acceptDate < to_date('2021', 'yyyy') and organization_ = 'abcdefghijklmnopqrstuvwxyz'
     group by to_char(acceptDate, 'yyyy') ) s

里面時間參數進行傳參即可。

補充：

統計今天（查詢當天或者指定某天數量）

1select count(1) FROM "shequjz_jibenxx" where to_char(zhongzhiriqi,'yyyy-mm-dd')='2019-11-11'

最近七天每天的數量：

select s.acceptDate, s.data_num
 from (select to_char(jiaozheng_jieshushijian, 'yyyy-mm-dd') as acceptDate,
        count(1) as data_num
     from shequjz_jibenxx t
     where t.jiaozheng_jieshushijian >= to_date('2020-11-06', 'yyyy-mm-dd')
      and t.jiaozheng_jieshushijian < to_date('2020-11-13', 'yyyy-mm-dd')
     group by to_char(jiaozheng_jieshushijian, 'yyyy-mm-dd') ) s ORDER BY acceptDate ASC

最近七天（1天、3天、7天、一個月、一年、1h、1min、60s）的數量（總量）：

# 包括今天向前推6天的總量
select count(1) from shequjz_jibenxx where jiaozheng_jieshushijian
between (SELECT current_timestamp - interval '7 day')
and current_timestamp
# 最近一天（昨天）
SELECT current_timestamp - interval '1 day'
# 最近三天
SELECT current_timestamp - interval '3 day'
# 最近一周
SELECT current_timestamp - interval '7 day'
# 最近一個月（當前時間向前推進一個月）
SELECT current_timestamp - interval '1 month'
# 最近一年（當前時間向前推進一年）
SELECT current_timestamp - interval '1 year'
# 最近一小時（當前時間向前推一小時）
SELECT current_timestamp - interval '1 hour'
# 最近一分鐘（當前時間向前推一分鐘）
SELECT current_timestamp - interval '1 min'
# 最近60秒（當前時間向前推60秒）
SELECT current_timestamp - interval '60 second'

最近七天中每天的累計歷史總量：

步驟：

1）先統計出近7天每天的數量

2）后統計出7天前的累計歷史總量

3）再對第(1)步中獲取的結果進行累計求和，使用cumsum()函數

4）最后在第(3)步結果的基礎上，加上7天前的累計歷史總量（也就是第2步的結果）

# 趨勢
def getWeekTrends(self):
  try:
    database = DataBase()
    sql = """select s.zhongzhi_Date, s.data_num
        from (select to_char(jiaozheng_jieshushijian, 'yyyy-mm-dd') as zhongzhi_Date,
        count(1) as data_num
        from shequjz_jibenxx t
        where t.jiaozheng_jieshushijian >= to_date('{}', 'yyyy-mm-dd')
        and t.jiaozheng_jieshushijian < to_date('{}', 'yyyy-mm-dd')
        group by to_char(jiaozheng_jieshushijian, 'yyyy-mm-dd') ) s""".format(lastweek, today[:10])
    res_df = database.queryData(sql, flag=True)
 
    sql_total = """select count(1) FROM "shequjz_jibenxx" where rujiaoriqi is not null
           and zhongzhiriqi is null and to_char(rujiaoriqi,'yyyy-mm-dd')<'{}'""".format(lastweek)
    res_total = database.queryData(sql_total, count=1, flag=False)  #7131
 
    res_df['cumsum'] = res_df['data_num'].cumsum() # 累計求和
    res_df['cumsum'] = res_df['cumsum'] + res_total[0]
    res_df = res_df[['zhongzhi_date', 'cumsum']].to_dict(orient='records')
    res = {'code': 1, 'message': '數據獲取成功', 'data': res_df}
    print(res)
    return res
  except Exception as e:
    error_info = '數據獲取錯誤：{}'.format(e)
    logger.error(error_info)
    res = {'code': 0, 'message': error_info}
    return res
{'code': 1, 'message': '數據獲取成功', 'data': [
{'zhongzhi_date': '2020-11-13', 'cumsum': 7148},
{'zhongzhi_date': '2020-11-10', 'cumsum': 7161},
{'zhongzhi_date': '2020-11-11', 'cumsum': 7195},
{'zhongzhi_date': '2020-11-12', 'cumsum': 7210},
{'zhongzhi_date': '2020-11-09', 'cumsum': 7222},
{'zhongzhi_date': '2020-11-14', 'cumsum': 7229},
{'zhongzhi_date': '2020-11-15', 'cumsum': 7238}]}

postgresql按周統計數據

（實際統計的是 上周日到周六 7天的數據）：

因為外國人的習慣是一周從周日開始，二我們中國人的習慣一周的開始是星期一，這里 -1 即將顯示日期從周日變成了周一，但是內部統計的數量還是從 上周日到周六進行 統計的，改變的僅僅是顯示星期一的時間。

提取當前星期幾： 1

1SELECT EXTRACT(DOW FROM CURRENT_DATE)

提取當前日期： 2020-11-16 00:00:00

1SELECT CURRENT_DATE-(EXTRACT(DOW FROM CURRENT_DATE)-1||'day')::interval diffday;

按周統計數據一：

select to_char(jiaozheng_jieshushijian::DATE-(extract(dow from "jiaozheng_jieshushijian"::TIMESTAMP)-1||'day')::interval, 'YYYY-mm-dd') date_,
count(1) from shequjz_jibenxx where jiaozheng_jieshushijian BETWEEN '2020-01-01' and '2020-11-16'
 GROUP BY date_ order by date_

其中date_為一周中的第一天即星期一

按周統計數據二：

SELECT
to_char ( cda.jiaozheng_jieshushijian, 'yyyy ' ) || EXTRACT ( WEEK FROM cda.jiaozheng_jieshushijian ) :: INTEGER AS date_,
count( cda.id ) AS count,
cda.jiaozheng_jieshushijian AS times
FROM
shequjz_jibenxx AS cda
 
WHERE
1 = 1
AND to_char ( cda.jiaozheng_jieshushijian, 'YYYY-MM-DD HH24:MI:SS' ) BETWEEN '2020-10-01 00:00:00' AND '2020-11-12 00:00:00'
GROUP BY
date_,
times
ORDER BY
date_,
times DESC

postgresql中比較日期的四種方法

select * from user_info where create_date >= '2020-11-01' and create_date <= '2020-11-16'
select * from user_info where create_date between '2020-11-01' and '2020-11-16'
select * from user_info where create_date >= '2020-11-01'::timestamp and create_date < '2020-11-16'::timestamp
select * from user_info where create_date between to_date('2020-11-01','YYYY-MM-DD') and to_date('2020-11-16','YYYY-MM-DD')