+ timestamp '2001-09-28 01:00' + interval '23 hours' timestamp '2001-09-29 00:00' + time '01:00' + interval '3 hours' time '04:00' - - interval '23 hours' interval '-23:00' - date '2001-10-01' - date '2001-09-28' integer '3' - date '2001-10-01' - integer '...
第二个CTEhours_per_day是真实的的主力。它确定日期是期间的第一天还是最后一天。对于每一天，它计算这...
to_timestamp和to_date会忽略TM修饰语。 如果没有使用FX选项,to_timestamp和to_date会跳过输入字符串中的多个空白。例如,to_timestamp('2000 JUN', 'YYYY MON')是正确的,但to_timestamp('2000 JUN', 'FXYYYY MON')会返回一个错误,因为to_timestamp只期望一个空白。FX必须被指定为模板中的第一个项。 to...
date_part('hour','2020-07-28 07:55'::timestamp - '2020-07-28 08:05'::timestamp); Explanation: Suppose we need to know the difference between two hours at that time. We use the above statement. Illustrate the end result of the above declaration by using the use of the following sn...
aNOT BETWEENxANDy 等效于 a < xORa > y 三、 数学函数和操作符: 下面是PostgreSQL中提供的数学操作符列表: 按位操作符只能用于整数类型,而其它的操作符可以用于全部数值数据类型。按位操作符还可以用于位串类型bit和bit varying, 下面是PostgreSQL中提供的数学函数列表,需要说明的是,这些函数中有许多都存在多种...
PostgreSQL support interval data type to store and manipulate period of time in years, months, days, hours, minutes, seconds, etc. Here years, months, and days are integer values where the seconds field can have fractional values. PostgreSQL interval data type takes 16 bytes of storage that ...
SELECT * FROM generate_series(2,4); generate_series --- 2 3 4 (3 rows) SELECT * FROM generate_series('2008-03-01 00:00'::timestamp, '2008-03-04 12:00', '10 hours'); generate_series --- 2008-03-01 00:00:00 2008-03-01 10:00:00 2008-03-01 20:00:00 2008-03-02 06:...
计算小时,分,秒,毫秒 select Days, A, TRUNC(A*24) Hours, TRUNC(A*24*60 - 60*TRUNC(A*24)) Minutes, TRUNC(A*24*60*60 - 60*TRUNC(A*24*60)) Seconds, TRUNC(A*24*60*60*100 - 100*TRUNC(A*24*60*60)) mSeconds from ( select trunc(sysdate) Days, sysdate - trunc(sysdate) A ...
timestamp '2001-09-28 23:00' - interval '23 hours' How to compare timestamp with tsrange ? PostgreSQL: Documentation: 9.3: Range Functions and Operators https://www.postgresql.org/docs/9.3/functions-range.html '[2011-01-01,2011-03-01)'::tsrange @> '2011-01-10'::timestamp ...
Hence, 85 hours are equivalent to 3 days and 13 hours. Conclusion In PostgreSQL, you can leverage excellent temporal datatypes and functions to streamline your work with date, time, and timestamps in databases, reducing your efforts effectively. We should try using them frequently. ...