E Oracle SQL Reserved Words and Keywords F Extended Examples Index Syntax trunc_date::= Description of the illustration trunc_date.eps Purpose TheTRUNC(date) function returnsdatewith the time portion of the day
在SQL中使用Oracle的TRUNC函数可以将日期或数字值截断到指定的精度级别。这在很多情况下非常有用,比如在需要比较日期或数字值时,可以通过截断到相同的精度级别来确保比较的准确性。另外,TRUNC函数还可以用于对日期进行舍入,或者将日期值转换为特定的格式。 总的来说,Oracle的TRUNC函数可以帮助我们更方便地处理日期和数字...
add_months(date,number) PS :如果不清楚看后面的能量包 23333.png SELECT TRUNC(add_months(SYSDATE,-1),'mm')--返回上月第一天 ,TRUNC(add_months(SYSDATE,0),'mm')-1--返回上月最后一天 ,to_date(to_char(add_months(SYSDATE,-1),'yyyy-mm-dd'),'yyyy-mm-dd')--返回上月当前日期 ,trunc(sy...
SELECT LAST_DAY(ADD_MONTHS(SYSDATE,-1)) FROM DUAL --- 上个月最后一日 SELECT MONTHS_BETWEEN(SYSDATE,DATE'2019-02-13') FROM DUAL --- 两个时间段间的月差距 SELECT NEXT_DAY(SYSDATE,1) FROM DUAL; --- 明天 SELECT NEXT_DAY(SYSDATE,2) FROM DUAL; --- 后天 SELECT SYSDATE - 1 FROM DUAL...
However, it is supported by PostgreSQL and Oracle. Databases such as MySQL do not support this function. You can check our tutorial on the extract() function as an alternative. Function Syntax: The following shows the syntax of the function in SQL: DATE_TRUNC(unit, source_date) The ...
(sysdate - to_date('20140709 23:12:12','yyyy/mm/dd hh24:mi:ss')) from dual;--两个日期相差的天数 select trunc(sysdate - 1) from dual;--昨天 select trunc(sysdate + 1) from dual;--明天 select trunc(sysdate, 'yyyy') from dual;--当年第一天 select trunc(sysdate, 'q') from dual...
select to_char(trunc(sysdate),'yyyymmdd hh24:mi:ss') from dual; --默认截取到日(当日的零点零分零秒) 20111229 00:00:00 select trunc(sysdate-1,'w') from dual; -- 离当前时间最近的周四,若当天为周四则返回当天,否则返回上周四 2011-12-22 ...
SQL> select trunc(17.97, -1) from dual; TRUNC(17.97,-1) --- 10 总结:当n2位正数时,截取小数点有右边的位置。当N2小数点位负数时,则截取小数点左边的位置,被截取部分记为0. 3.TRUNC截取日期 TRUNC(date)返回以指定格式fmt截取一部分的日期格值,该函数对NLS_CALENDAR会话参数是不敏感的。它按照公历规则...
我正试图在oracle中将其转换为简单的日期(不包括时间或时区)，这样我就可以将它与自定义的mybatis SQL...
The OracleTRUNC()function returns aDATEvalue truncated to a specific component (e.g., day, month, year), and zeroing out smaller components like times or later date parts. Here’s the syntax of the OracleTRUNC()function: TRUNC(date, format)Code language:SQL (Structured Query Language)(sql)...