TRUNC(number[,decimals])
number 待做截取处理的数值decimals 指明需保留小数点后面的位数。可选项,忽略它则截去所有的小数部分(默认为0)
select TRUNC(5.75) from dual;
--Output:5
select TRUNC(-5.75) from dual;
--Output:-5
SELECT TRUNC(109.29, 1) truncated FROM dual;
--Output:109.2
SELECT TRUNC(109.29, -1) truncated FROM dual;
--Output:100
SELECT TRUNC(1234.5678, -3) FROM DUAL;
--Output:1000
TRUNC(date[,fmt])
date 一个日期值fmt 日期格式,该日期将由指定的元素格式所截去。忽略它则由最近的日期截去
SELECT SYSDATE FROM dual;
--Output:04.06.2012 22:37:03
SELECT trunc(sysdate,'yyyy') FROM dual;
--Output:01.01.2012 00:00:00,返回当年第一天.
SELECT trunc(sysdate,'mm') FROM dual;
--Output:01.06.2012 00:00:00 返回当月第一天.
SELECT trunc(sysdate,'d') FROM dual;
--Output:03.06.2012 00:00:00 返回当前星期的第一天.
SELECT trunc(sysdate,'dd') FROM dual;
--Output:04.06.2012 00:00:00 返回当前年月日
select trunc(sysdate) FROM dual;
--Output:04.06.2012 00:00:00
select * from MTL_MATERIAL_TRANSACTIONS
where trunc(creation_date) = To_Date('04-06-2012','dd-mm-yyyy');
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