Question

我使用Oracle SQL，我有一个包含3列的表：Typeface tf = Typeface.createFromAsset(v.getContext().getAssets(), "fonts/advent_pro_medium.ttf"); etJoinCode.setTypeface(tf);，Process和Start Date。我想计算每个过程的持续时间。

我使用了这个查询：

End Date

，结果是几天。

例如：开始日期为select (enddate.date_value - startdate.date_value) as duration from dual，结束日期为30.3.2016 17:14:53

当我使用查询时，结果是8.7.2016 14:51:21，但我想要这样的结果： 99.90032407407407407407407407407407407407。

我该怎么做？

Answer 1

此复杂查询（特别是DAY !!）：

要计算正确的Day我将Month和12 * Year添加到原始日期。

with dates as(
select
   sysdate       as d1,
   sysdate-99.90032407407407407407407407407407407407-365  as d2
from
   dual
),
dates_parts as (
SELECT
    d1,
    d2,
    EXTRACT(YEAR   FROM (d1 - d2) YEAR TO MONTH ) as Year,
    EXTRACT(MONTH  FROM (d1 - d2) YEAR TO MONTH ) as Month,
    EXTRACT(DAY    FROM (d1 - d2) DAY TO SECOND ) as Day,
    EXTRACT(HOUR   FROM cast(d1 as timestamp) - cast(d2 as timestamp)) as Hour,
    EXTRACT(MINUTE FROM cast(d1 as timestamp) - cast(d2 as timestamp)) as Minute,    
    EXTRACT(SECOND FROM cast(d1 as timestamp) - cast(d2 as timestamp)) as Second
FROM dates
)
select
    dates_parts.Year,
    dates_parts.Month,
    dates_parts.Day,
    dates_parts.Hour,
    dates_parts.Minute,
    dates_parts.Second,
    EXTRACT(DAY FROM (d1 - ADD_MONTHS(d2,Month+Year*12)) DAY TO SECOND ) as Day_Corrected
from 
    dates_parts

将生成不同的日期部分：

| YEAR | MONTH | DAY | HOUR | MINUTE | SECOND | DAY_CORRECTED |
|------|-------|-----|------|--------|--------|---------------|
|    1 |     3 | 464 |   21 |     36 |     28 |             7 |

Answer 2

两个DATE值之间的差异是表示天数的number。您似乎想要interval，可以使用TIMESTAMP值来完成此操作。

select cast(enddate as timestamp) - cast(startdate as timestamp)
from the_table

subtracting a timestamp from a timestamp的结果是间隔。

然而，

interval值的格式化在Oracle中非常棘手。参见例如format interval with to_char

Answer 3

根据我之前的回答，您可以创建一个Oracle函数sinceHumanReadable：

来自https://momentjs.com/docs/#/plugins/preciserange/的

例子产生相同的结果

moment("2014-01-01 12:00:00").preciseDiff("2015-03-04 16:05:06");
// 1 year 2 months 3 days 4 hours 5 minutes 6 seconds

http://sqlfiddle.com/#!4/d6783/1

create or replace FUNCTION sinceHumanReadable(start_date IN date,end_date IN date) 
    RETURN VARCHAR2
IS result VARCHAR2(255);

    BEGIN 

    with 
    dates_parts as (
    SELECT
        EXTRACT(YEAR   FROM (end_date - start_date) YEAR TO MONTH ) as Year,
        EXTRACT(MONTH  FROM (end_date - start_date) YEAR TO MONTH ) as Month,       
        EXTRACT(HOUR   FROM cast(end_date as timestamp) - cast(start_date as timestamp)) as Hour,
        EXTRACT(MINUTE FROM cast(end_date as timestamp) - cast(start_date as timestamp)) as Minute,    
        EXTRACT(SECOND FROM cast(end_date as timestamp) - cast(start_date as timestamp)) as Second
    FROM dual
    ),
    dates_parts_with_day as (
    select        
        Year,Month,Hour,Minute,Second,
        EXTRACT(DAY FROM (end_date - ADD_MONTHS(start_date,Month+Year*12)) DAY TO SECOND ) as Day
    from dates_parts
    )
    select
        decode(dates_parts_with_day.Year, 0,'', dates_parts_with_day.Year  || ' years ' )||
        decode(dates_parts_with_day.Month,0,'', dates_parts_with_day.Month || ' months ')||
        decode(dates_parts_with_day.Day,0,'', dates_parts_with_day.Day || ' days ')||
        decode(dates_parts_with_day.Hour,0,'', dates_parts_with_day.Hour || ' hours ')||
        decode(dates_parts_with_day.Minute,0,'', dates_parts_with_day.Minute || ' minutes ')||
        dates_parts_with_day.Second || ' seconds'
    into result
    from 
        dates_parts_with_day;

    RETURN(result); 

    END sinceHumanReadable;
GO

查询

with dates as (    
  select sysdate-99.90032407407407407407407407407407407407 as d1,sysdate  as d2 from dual
  union all
  select to_date('2016-03-30 17:14:53','yyyy-mm-dd hh24:mi:ss') as d1,to_date('2016-07-08 14:51:21','yyyy-mm-dd hh24:mi:ss')   as d2 from dual
  union all
  select to_date('2014-01-01 12:00:00','yyyy-mm-dd hh24:mi:ss') as d1,to_date('2015-03-04 16:05:06','yyyy-mm-dd hh24:mi:ss')   as d2 from dual  
  union all
  select sysdate as d1,add_months(sysdate,35)   as d2 from dual
  union all
  select sysdate as d1,sysdate as d2 from dual
)
select
    d1,d2,
    sinceHumanReadable(d1,d2) as since
from
    dates;

将产生：

|                   D1 |                   D2 |                                               SINCE |
|----------------------|----------------------|-----------------------------------------------------|
| 2017-07-19T17:50:00Z | 2017-10-27T15:26:28Z |      3 months 7 days 21 hours 36 minutes 28 seconds |
| 2016-03-30T17:14:53Z | 2016-07-08T14:51:21Z |      3 months 7 days 21 hours 36 minutes 28 seconds |
| 2014-01-01T12:00:00Z | 2015-03-04T16:05:06Z | 1 years 2 months 3 days 4 hours 5 minutes 6 seconds |
| 2017-10-27T15:26:28Z | 2020-09-27T15:26:28Z |                         2 years 11 months 0 seconds |
| 2017-10-27T15:26:28Z | 2017-10-27T15:26:28Z |                                           0 seconds |

多天之间人类可读的经过时间

3 个答案: