selectleast(to_date('1996-10-10','YYYY-MM-DD'),sysdate)fromdual; --求最大的日期 selectgreatest(to_date('1996-10-10','YYYY-MM-DD'),sysdate)fromdual; --求最大值 selectgreatest(2,3,1,5)fromdual; --求最小值 selectleast(2,3,1,5)fromdual; 十一、EXTRACT(date FROM datetime) 提取...
Extract date, time from a given datetime in Oracle The EXTRACT() function is used to extract the value of a specified datetime field from a datetime or interval expression. Uses of Oracle EXTRACT (datetime) Function: Extracting Year, Month, or Day from a Date:Retrieve the year, month, or ...
TO_DATE(string, format_model): 将字符串转换为日期/时间(简称S转DT),转换过程中主要取决于format_model。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 selectTO_DATE('2024-04-29','yyyy-mm-dd')AS"DT1",--TO_DATE('2024-04-29 08:08:08','yyyy-mm-dd')AS"DT2",TO_DATE('2024-04-2...
1.add_months(date,i)函数:在指定日期上添加月份,i位任意整数; 2.next_day(date,char):若char的星期*,则返回date指定日期的下周*是哪天; 3.last_day(date)返回月的最后一天; 4.months_between(date1,date2):表示两个日期之间相隔的月份; 5. 间隔的天数:两个日期直接相减 6.extract(date from datetime)...
"Datetime/Interval Arithmetic" for a description of datetime_value_expr and interval_value_expr Oracle Database Reference Examples oe.orders SELECT EXTRACT(month FROM order_date) "Month", COUNT(order_date) "No. of Or...
SQL> select to_char(sysdate,''yyyy-mm-dd hh24:mi:ss'') time from dual; TIME --- 2004-10-08 15:22:58 即把当前时间按yyyy-mm-dd hh24:mi:ss格式转换成字符类型 在oracle中处理日期大全 TO_DATE格式 Day: dd number 12 dy abbreviated...
1:EXTRACT() 是一个 SQL 函数,用于从日期或时间值中提取特定的部分。它的基本语法如下: EXTRACT ( field FROM source ) 其中,field 指定要从 source 中提取的部分,可以是以下值之一: YEAR:年份 MONTH:月份 DAY:日 HOUR:小时(24 小时制) MINUTE:分钟 ...
SQL> SELECT hire_date, SYSDATE, EXTRACT(YEAR FROM (SYSDATE-hire_date) YEAR TO MONTH) "Years" 2 FROM employees WHERE ROWNUM <= 5; HIRE_DATE SYSDATE Years --- --- --- 17-JUN-87 23-FEB-07 19 21-SEP-89 23-FEB-07 17 13-JAN-93 23-FEB-07 14 ...
extract(datetime)函数 从给定的datetime中得到年、月、日、时、分、秒 SQL> select sysdate "date", 2 extract(year from sysdate)"year", 3 extract(month from sysdate)"month", 4 extract(day from sysdate)"day", 5 extract(hour from systimestamp)"hour", 6 extract(minute from systimestamp)"minu...
SELECTROUND(3.1415926,3),ROUND(3.1416926,2.5),ROUND(13.1415926,-1)FROMDUAL;--OUTPUT:3.142, 3.14, 10 (2)TRUNC(n,integer)函数:它把数值n根据integer的值进行截取。 SELECTTRUNC(3.1415926),TRUNC(3.1415926,4),TRUNC(3.1415926,2.5),TRUNC(13.1415926,-1)FROMDUAL;--OUTPUT:3, 3.1415, 3.14, 10 ...