Vertica用于时间计算的SQL语句大全

最新推荐文章于 2024-10-17 12:03:46 发布

原创最新推荐文章于 2024-10-17 12:03:46 发布 · 3.6k 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#sql #timestamp #select #vertica #database

大数据系统开发专栏收录该内容

30 篇文章

订阅专栏

本文演示了如何使用SQL进行时间日期的计算与转换，包括不同时间戳之间的差值计算及其单位转换，例如天数、小时、分钟及秒数的转换。

三个字：强、大、全，强力推荐之

SQL语句	查询结果
select (timestamp '2005-01-17 10:00' - timestamp '2005-01-01');	16 10:10
select (timestamp '2005-01-17 10:00' - timestamp '2005-01-01') / 7;	2 08:17:08.571429
select (timestamp '2005-01-17 10:00' - timestamp '2005-01-01') day;	16
select cast((timestamp '2005-01-17 10:00' - timestamp '2005-01-01') day as integer) / 7;	2
select floor((timestamp '2005-01-17 10:00' - timestamp '2005-01-01') / interval '7');	2
select timestamptz '2009-05-29 15:21:00.456789';	2009-05-2915:21:00.456789-04
select timestamptz '2009-05-28';	2009-05-2800:00:00-04
select timestamptz '2009-05-29 15:21:00.456789'-timestamptz '2009-05-28';	1 15:21:00.456789
select (timestamptz '2009-05-29 15:21:00.456789'-timestamptz '2009-05-28');	1 15:21:00.456789
select (timestamptz '2009-05-29 15:21:00.456789'-timestamptz '2009-05-28')(3);	1 15:21:00.457
select (timestamptz '2009-05-29 15:21:00.456789'-timestamptz '2009-05-28')second;	141660.456789
select (timestamptz '2009-05-29 15:21:00.456789'-timestamptz '2009-05-28') year;	0
select (timestamptz '2009-05-29 15:21:00.456789'-timestamptz '2007-01-01') month;	28
select (timestamptz '2009-05-29 15:21:00.456789'-timestamptz '2007-01-01') year;	2
select (timestamptz '2009-05-29 15:21:00.456789'-timestamptz '2007-01-01') year to month;	2-4
select (timestamptz '2009-05-29 15:21:00.456789'-timestamptz '2009-05-28') second(3);	141660.457
select (timestamptz '2009-05-29 15:21:00.456789'-timestamptz '2009-05-28') minute(3);	2361
select (timestamptz '2009-05-29 15:21:00.456789'-timestamptz '2009-05-28') minute;	2361
select (timestamptz '2009-05-29 15:21:00.456789'-timestamptz '2009-05-28') minute to second(3);	2361:00.457
select (timestamptz '2009-05-29 15:21:00.456789'-timestamptz '2009-05-28') minute to second;	2361:00.456789