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_...
select current_date; select extract(YEAR from now()); 取当前日期的年 select extract(month from now()); //取当前月 select extract(day from now()); //取当前日 2. 字符串操作 select 'aaaaa'||'bbbbbb' as f1; //字符串相加 select char_length('abcdefgh'); //字符串长度 select position...
}/**@param{string}id@param{object}data*/asyncfunctionupdateUserInfo(id, data){letcount =awaitpqorm.model('user').where({id: id}).update(data)if(count >0)returntruereturnfalse} 插入数据 letpqorm = initORM(dbconfig); ;(async() =>{lettm =Date.now();awaitpqorm.model('log').insert...
date =date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - POSTGRES_EPOCH_JDATE;/* Now check for just-out-of-range dates */if(!IS_VALID_DATE(date))ereport(ERROR, (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),errmsg("date out of range: \"%s\"", str)));PG_RETURN_DATEADT(date...
PostgreSQL Data TypesOverview of PostgreSQL data types PostgreSQL supports the following data types: Boolean Character types such as char, varchar, and text. Numeric types such as integer and floating-point number. Temporal types such as date, time, timestamp, and interval UUID for storing Universa...
这将把当前日期(CURRENT_DATE)转换为 ‘YYYY-MM-DD’ 格式的字符串,并返回结果。 你可以根据需要调整日期格式和字符串格式。 SqlServer 字符串转日期时间: convert(datetime,'2017-12-12 00:00:01', 20) 1. 日期时间转字符串: Select CONVERT(varchar(100), GETDATE(), 0): 05 16 2006 10:57AM ...
select date ‘2015-04-10’ + ‘7’::integer; Result:2015-04-17 b) 日期与时间间隔(interval)的运算: select date ‘2015-04-10’ + interval ‘3 years’; select date ‘2015-04-10’ + interval ‘3 months’; select date ‘2015-04-10’ + interval ‘3 days’; ...
#!/usr/bin/python3 import datetime from datetime import date from dateutil.relativedelta import * from pg_add_partition_table import create_table # Get the 1st day of the next month def get_next_month_first_day(d): return date(d.year + (d.month == 12), d.month == 12 or d.month...
create or replace function get_uv_byrid ( v_rid int2, v_begin_cts1 date, -- 窗口1的开始时间 v_end_cts1 date -- 窗口1的结束时间 ) returns int8 as $$ select count(distinct uid) from tbl where rid=v_rid and cts >= v_begin_cts1 and cts < v_end_cts1; $$ language sql ...
你可以把一个子串放到双引号里强迫它被解释成一个文本,即使它里面包含模式关键字也如此。例如,在 '"Hello Year "YYYY'中,YYYY将被年份数据代替,但是Year中单独的Y不会。在to_date、to_number和to_timestamp中,双引号字符串会跳过包含在字符串中字符个数的字符,例如"XX"跳过两个输入字符。