如何在Oracle sql查询中编写mysql TIMESTAMPDIFF函数 [英] How to write mysql TIMESTAMPDIFF function in Oracle sql query

问题描述

我在 Mysql 中有查询，它使用表中的 TIMESTAMPDIFF 返回分钟.但现在我已将数据迁移到 Oracle.所以我想使用相同的查询来获取 Oracle 表中的 TIMESTAMPDIFF.Oracle 也不支持 mysql 中的 NOW() 函数.查询中的 PROCESS_START_DATE 列包含包含日期和时间的数据.我在 oracle 中尝试了 EXTRACT 功能，但是没有用.这是我的查询:

I have query in Mysql which return minutes using TIMESTAMPDIFF in table. But now i have migrated my data to Oracle. So i want to use the same query to get the TIMESTAMPDIFF in a table in Oracle. Oracle also dont support NOW() function in mysql. The PROCESS_START_DATE column in query have data which contains date and time. I tried EXTRACT function in oraclebut did not work. Here is my query :

    select * from(
    select trunc(abs(to_date('27/01/2015 08:00:00','dd/mm/yyyy hh:mi:ss') - PMS.PROCESS_START_DATE)*24*60),PM.NAME,PM.ENABLED
    from PROCESS_MONITOR_STATISTIC PMS
    JOIN PROCESS_MONITOR PM ON PM.ID=PMS.PROCESS_MONITOR_ID   
    WHERE PM.ENABLED=1 AND PM.NAME= 'WORKFLOWENGINE1'
    order by PMS.PROCESS_START_DATE desc
) 
where ROWNUM = 1

推荐答案

你可以这样做:

--in case you are working with dates
select trunc(abs(to_date('26/01/2015 08:00:00','dd/mm/yyyy hh:mi:ss') - sysdate)*24*60) from dual; 

这表示日期和现在(系统日期)之间的分钟差异.

This represent difference in minutes between a date and now(sysdate) with dates.

--timestamp case
select abs(
extract (day from diff)*24*60 + extract (hour from diff)*60 + extract (minute from diff)) from
(select to_timestamp('27/01/2015 09:07:00','dd/mm/yyyy hh:mi:ss') - systimestamp diff from dual);

这表示日期和现在(系统时间戳)之间的分钟差异(带时间戳).

This represent difference in minutes between a date and now(systimestamp) with timestamp.

此查询计算一年中的分钟数:

This query calculate minutes in a year:

select 365*24*60 from dual -- this returns 525600

这是您的查询.我改变时间.检查这些日期之间的差异是否为一年零五分钟

This is your query. i change the time. Check that the difference between these dates is one year and five minutes

select trunc(abs((to_date('26/01/14 09:00:00','dd/mm/yy hh24:mi:ss')-
to_date('26/01/2015 09:05:01','dd/mm/yyyy hh24:mi:ss'))*24*60)) from dual;

所以，当运行这个查询结果是525605，一年多五分钟.所以它看起来有效.

So, when run this query result is 525605, five minutes more than a year. So it looks to be working.

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