test=# select extract (month from timestamp '2017-07-31 22:18:00'); date_part 7 (1 row) test=# select extract (month from interval '2 years 11 months'); date_part 11 (1 row) 7. week (返回当前是几年的第几个周) test=# select extract (week from timestamp '2017-07-31 22:18...
5、另外还可以在Month中直接加GETDATE函数获取当前时间的月份。方案一：extract(year from 时间) + '-' extract(month from 时间)方案二：to_date( "2003-02-05 ", "yyyy-mm")EXTRACT (field from source)函数从日期/时间数值里抽取 子域，比如年或者小时等。source 必须是一个类型 timestamp，t...
extract(field from interval) double 获取子域 extract(month from interval '2 years 3 months') 3 localtime time 今日的时间 localtimestamp timestamp 日期和时间 now() timestamp 当前的日期和时间(等效于 current_timestamp) timeofday() text 当前日期和时间 5.3、 日期/时间差(EXTRACT/date_part/...
SELECT EXTRACT(YEAR FROM timestamp) AS year, EXTRACT(MONTH FROM timestamp) AS month, EXTRACT(DAY FROM timestamp) AS day FROM table_name; 复制代码 将时间戳格式化为特定的字符串: SELECT TO_CHAR(timestamp, 'YYYY-MM-DD HH:MI:SS') AS formatted_timestamp FROM table_name; 复制代码 这些是一...
2.3 CURRENT_TEMPSTAMP(): 返回会话时区中的当前时间戳 2.4 EXTRACT(): 从给定的表达式中返回制定的日期时间字段 例如: selectfrom current_timestamp) from selectMONTH from current_timestamp) from selectDAY from current_timestamp) from selectHOUR from current_timestamp) from ...
6. month (月份) test=# select extract (month from timestamp '2017-07-31 22:18:00'); date_part --- 7 (1 row) test=# select extract (month from interval '2 years 11 months'); date_part --- 11 (1 row) 7. week (返回
SELECTdate_part('year',timestamp'2020-03-03 20:38:40'),extract(yearfromtimestamp'2020-03-03 20:38:40'),date_part('month',interval'1 years 5 months'),extract(monthfrominterval'1 years 5 months');date_part|date_part|date_part|date_part|---|---|---|---|2020|2020|5|5| 通过...
-- unix时间戳一般是10位,如果遇到13位的情况需要除1000; -- 末尾+1表示多1秒,例如1681574401为2023-04-16 00:00:02,也就是说两个unix时间的差值数字,表示差的秒数 select to_timestamp(1681574401); 时间戳 转 unix时间 select extract(epoch from '2023-04-16 00:00:01'::timestamp); 2.2.时间戳和...
extract| ---+ 19| EXTRACT() : month To extract the month from a given timestamp, you can use the EXTRACT function with the "month" field. SQL Code: SELECT EXTRACT(MONTH FROM TIMESTAMP '2023-03-11 17:43:17.436'); Output: extract...
extract(hour from timestamp '2001-02-16 20:38:40')→ 20 extract ( field from interval ) → double precision 获取时间间隔子字段 extract(month from interval '2 years 3 months')→ 3 isfinite ( date ) → boolean 测试有限日期(不是+/-无限) isfinite(date '2001-02-16')→ true isfinite...