int getYear()/int getMonthValue()/int getDayOfMonth() 得到当前日期的年、月和日。...(2); //获取后2周的日期 LocalDate date4= LocalDate.now().plusWeeks(2); //获取前2月的日期...(date8.toString()); } } Java获取当前时间的上一年、下一年、上个月、下个月、前一天,当天,本周,上周,...
Example 3: Getting Month Name From Current Date To get the month name from the current date, the CURRENT_DATE function and “Month” are passed as arguments to the TO_CHAR() function: SELECTTO_CHAR(CURRENT_DATE,'Month')AScurrent_month_name; The stated function succeeded in getting the mon...
select * from orders where year(ordersDate)=2010;--查看2010年之前的订单 select * from orders where year(ordersDate)<2010;--查看2010之前的1~10月之间的订单 -- 年份<2010 -- 月份 1~10 select * from orders where year(ordersDate)<2010 and month(ordersDate) between 1 and 10;--查看客户名字...
带三个参数的substring,substring(string from pattern for escape-character),提供了一个从字串中抽取一个匹配SQL正则表达式模式的子字串的函数。和SIMILAR TO一样,声明的模式必须匹配整个数据串,否则函数失效并返回NULL。为了标识在成功的时候应该返回的模式部分,模式必须出现后跟双引号(")的两个转 义字符。匹配这两...
a IS NOT DISTINCT FROM b 对于非空输入,IS DISTINCT FROM和<>操作符一样。不过,如果两个输入都为空,它会返回假。而如果只有一个输入为空,它会返回真。类似地,IS NOT DISTINCT FROM对于非空输入的行为与=相同,但是当两个输入都为空时它返回真,并且当只有一个输入为空时返回假。因此,这些谓词实际上把空值...
v_partition_name=to_char(to_date(v_date_start,'yyyy-mm-dd')+i,'yyyymmdd');SELECTcount(1)intov_cntfrompg_tableswhereschemaname=v_schema_nameandtablename=v_table_name||'_'||v_partition_name;ifv_cnt=0thenv_exec_sql=v_exec_sql||'create table'||v_schema_name||'.'||v_table_name...
date_parttakes two arguments: '[which_part_you_need]' The[which_part_you_need]has to be replaced with the part of the date/time you need from your timestamp. (E.g.year,month,day,hour, etc.) (SELECT current_timestamp) And this function gets the current date and time… Important syn...
Or the monthly uniques for this year? SELECTEXTRACT(MONTHFROMdate)ASmonth, hll_cardinality(hll_union_agg(users))FROMdaily_uniquesWHEREdate>='2012-01-01'ANDdate<'2013-01-01'GROUP BY1; Or how about a sliding window of uniques over the past 6 days?
INTERNAL_DATE_MAX Internal timestamp retrieves from custom type are extracted in the following format: 01-JAN-77 12.00.00.000000 AM. It is impossible to know the exact century that must be used, so by default any year below 49 will be added to 2000 and others to 1900. You can use ...
DATEDATECalendar date (year, month, day) TIMETIMETime (without time zone) TIMESTAMPTIMESTAMPDate and time (without time zone) TIMESTAMPDATETIMETime (without time zone) VARCHAR(4)YEARVariable length character representing year An error results when TIME data is out of range (00:00:00 – 24:...