PostgreSQL-DATEDIFF-日期时间差,以秒,天,月,周等为单位 您可以使用各种日期时间表达式或用户定义的 DATEDIFF 函数(UDF)在 PostgreSQL 中计算两个日期时间值之间的差,以秒,分钟,小时,天,周,月和年为单位。 总览 PostgreSQL 不提供类似于 SQL Server DATEDIFF 的[2] DATEDIFF 函数,但是您可以使用各种表达式或 UDF ...
SELECT DATEDIFF(day, '2011-12-29 23:00:00', '2011-12-31 01:00:00'); -- Result: 2 1. 2. 3. 请注意,DATEDIFF 返回了 2 天,尽管 datetime 值之间只有 1 天 2 小时。 在PostgreSQL 中,如果您从另一个中减去一个日期时间值(TIMESTAMP,DATE 或 TIME 数据类型),则将获得一个 INTERVAL 值,格...
所以干脆把代码封装成一个熟悉的dateDiff方法。不过这个方法跟VB和sql里的dateDiff还是有点不一样，虽然可...
Note that SQL Server does not return the number of full months between two datetimes, it calculates the difference between the month and year parts only. SQL Server: -- Get difference in months (1 day is actual difference between 2 dates below) SELECT DATEDIFF(month, '2023-12-31', '...
(<datepart> ,<number> ,<date>) --函数返回指定日期date 加上指定的额外日期间隔number 产生的新日期 DATEDIFF(<datepart> ,<number> ,<date>) --函数返回两个指定日期在datepart 方面的不同之处 DATENAME(<datepart> , <date>) --函数以字符串的形式返回日期的指定部分 DATEPART(<datepart> , <date>) ...
Remember thatDATE/INTEGERSare calculated as the number of days but not in months, years, or other units of time. Many people would tend to implement theDATEDIFFandDATEADDfunctions to PostgreSQL in its extensions. Here, you may even be able to use them if all else fails. ...
SQL Server:GETDATE() Oracle:Select add_months(sysdate,12) from dual SQL Server:Select dateadd(mm,12,getdate()) Oracle:SELECT sysdate -add_months(sysdate,12) FROM dual SQL Server:SELECT datediff(dd, GetDate(),dateadd(mm,12,getdate()))...
--DifferencebetweenOct02,2011andJan01,2012inmonthsSELECTDATEDIFF(month,'2011-10-02','2012-01-01');--Result:3 在PostgreSQL 中,您可以将年份之间的差值乘以 12,然后将月份部分之间的差值相加(可以为负)。 PostgreSQL: --Difference between Oct02,2011andJan01,2012in monthsSELECT(DATE_PART('year','201...
DATEDIFF in Report Builder DateDiff In Reporting Services DateDiff to show working days DateTime Conversion and Comparison - Errors DateTime parameter with NULL value DateTime parameter with NULL value is default DateTime to string in expression for parameter usage DB tables records/data update using SSR...
SQL Server:GETDATE() Oracle:Select add_months(sysdate,12) from dual SQL Server:Select dateadd(mm,12,getdate()) Oracle:SELECT sysdate -add_months(sysdate,12) FROM dual SQL Server:SELECT datediff(dd, GetDate(),dateadd(mm,12,getdate()))...