Question

如何计算Postgresql中两个YYYYMM整数值之间的月数？

DATA：

| Date1  | Date2  |
|--------|--------|
| 201608 | 201702 |
| 201609 | 201610 |

期望的输出：

| Date1  | Date2  | MonthsBetweenInclusive | MonthsBetweenExclusive |
|--------|--------|------------------------|------------------------|
| 201608 | 201702 | 7                      | 6                      |
| 201609 | 201610 | 2                      | 1                      |

我查看了PostgreSQL日期函数文档，但是我找不到一个对YYYYMM整数值进行操作的解决方案。

Answer 1

with t(d1,d2) as (values(201608,201702),(201609,201610))
select
  *,
  ((d2/100*12)+(d2-d2/100*100))-((d1/100*12)+(d1-d1/100*100))
from t;

Answer 2

with t (date1, date2) as (values
    (201608,201702),(201609,201610)
)
select array_length(
    array((
        select generate_series(
            to_date(date1::text, 'YYYYMM'),
            to_date(date2::text, 'YYYYMM'),
            '1 month'
        )
    )), 1
)
from t
;
 array_length 
--------------
            7
            2

Answer 3

还有更多方法 - 什么是正确的，取决于你的情况：

select extract( months from (justify_interval(to_timestamp('201610','YYYYMM') -
                                              to_timestamp('201609','YYYYMM'))));
┌───────────┐
│ date_part │
╞═══════════╡
│         1 │
└───────────┘
(1 row)

或

CREATE OR REPLACE FUNCTION month_number(date)
RETURNS int AS $$
  SELECT ((EXTRACT(year FROM $1) - 1900) * 12 +
          EXTRACT(month FROM $1))::int
$$ LANGUAGE sql;

SELECT month_number(to_date('201702','YYYYMM')) - 
       month_number(to_date('201608','YYYYMM'));
┌──────────┐
│ ?column? │
╞══════════╡
│        6 │
└──────────┘
(1 row)

或

SELECT (to_date('201702','YYYYMM') - 
        to_date('201608','YYYYMM'))/30;
┌──────────┐
│ ?column? │
╞══════════╡
│        6 │
└──────────┘
(1 row)

Answer 4

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Stack trace:
#0 /home/stroylocman/www/htdocs/ckfinder/core/connector/php/vendor/cksource/ckfinder/src/CKSource/CKFinder/Config.php(73): CKSource\CKFinder\Config->validate()
#1 /home/stroylocman/www/htdocs/ckfinder/core/connector/php/vendor/cksource/ckfinder/src/CKSource/CKFinder/CKFinder.php(91): CKSource\CKFinder\Config->__construct('/home/stroylocm...')
#2 /home/stroylocman/www/htdocs/ckfinder/core/connector/php/vendor/pimple/pimple/src/Pimple/Container.php(113): CKSource\CKFinder\CKFinder->CKSource\CKFinder\{closure}(Object(CKSource\CKFinder\CKFinder))
#3 /home/stroylocman/www/htdocs/ckfinder/core/connector/php/vendor/cksource/ckfinder/src/CKSource/CKFinder/CKFinder.php(185): Pimple\Container->offsetGet('config')

Answer 5

select yt.date1,
   yt.date2,
   trunc(EXTRACT(EPOCH from age(to_timestamp(yt.date2::TEXT, 'YYYYMM'),to_timestamp(yt.date1::TEXT, 'YYYYMM')))/(3600*24*30)),
   trunc(EXTRACT(EPOCH from age(to_timestamp(yt.date2::TEXT, 'YYYYMM'),to_timestamp(yt.date1::TEXT, 'YYYYMM')))/(3600*24*30)) +1
 from your_table yt

如何计算PostgreSQL中YYYYMM整数值之间的月数？

5 个答案: