-- 截断当前日期到月,返回当前月份的第一天 SELECT DATE_TRUNC('month', CURRENT_DATE) AS first_day_of_month; -- 截断当前日期到天,返回当前日期(实际上没有变化) SELECT DATE_TRUNC('day', CURRENT_DATE) AS truncated_date; 1. 2. 3. 4. 5. 八、优化日期计算 在进行日期计算时,为了提高效率,可以...
select TO_CHAR((DATE_TRUNC('MONTH', to_date('20230307','YYYYMMDD')) + INTERVAL '-1 MONTH')::DATE,'YYYYMM') AS "LAST_MONTH", TO_CHAR((DATE_TRUNC('MONTH', to_date('20230307','YYYYMMDD')) + INTERVAL '-1 MONTH')::DATE,'YYYYMMDD') AS "LASST_MONTH_FIRST_DAY", TO_CHAR((DATE_...
date、time、datetime、tzinfo、timedelta 等等。
获取上月开始结束日期考虑了年份的变化 */ var now = new Date(); //当前日期 var nowDayOfWeek ...
结果显示直接将field = hour,即分和秒截断了,如果是hour那么minute和second的值就为00,如果是month那么day=1,如果是year那么month和day均为1。 6. 判断时间是否重合 OVERLAPS:返回bool值,判断两个时间间隔是否重合,只要存在重合即返回true否者返回false。两个重载的方式 ...
.month + 1 , 1) def create_sub_table(db, table): # Get current date d1 = date.today() # Get next month's date d2 = d1 + relativedelta(months=+1) # Get the 1st day of the next month;As the starting value of the partitioned table start_date = get_next_month_first_day(d...
.month + 1 , 1) def create_sub_table(db, table): # Get current date d1 = date.today() # Get next month's date d2 = d1 + relativedelta(months=+1) # Get the 1st day of the next month;As the starting value of the partitioned table start_date = get_next_month_first_day(d...
W Week of the month (1-5), where week 1 begins on the first day of the month IW ISO Week of the year (01-53) DAY The name of the day in capital letters, completed with spaces up to 9 characters long Day The name of the day with a capital letter, completed with spaces up to...
PostgreSQL releases before 8.0 did not follow the conventional numbering of centuries, but just returned the year field divided by 100. day The day (of the month) field (1 - 31) SELECT EXTRACT(DAY FROM TIMESTAMP '2001-02-16 20:38:40'); Result: 16 decade The year field divided by 10...
First we have the bare bones of the PostgreSQL Interval, Date and Timestamp Data types. Here are the questions: What types are they? And what options do they have? What postgresql.conf variables affect date and time i/o?