oracle中extract()函数从oracle 9i中引入,用于从一个date或者interval类型中截取到特定的部分 语法如下: extract ( {year|month|day|hour|minute|second }|{ timezone_hour|timezone_minute }|{ timezone_region|timezone_abbr }from{ date_value|interval_value } ) 只可以从一个date类型中截取年月日 SQL>se...
YEAR MONTH DAY --- --- --- 2016 7 25 The time (hour, minute or second) components can be found by either: UsingCAST( datevalue AS TIMESTAMP )to convert theDATEto aTIMESTAMPand then usingEXTRACT( [ HOUR | MINUTE | SECOND ] FROM timestampvalue ); or UsingTO_CHAR( dat...
In Oracle/PLSQL, the extract function extracts a value from a date or interval value. The syntax for the extract function is: EXTRACT ( { YEAR | MONTH | DAY | HOUR | MINUTE | SECOND } | { TIMEZONE_HOUR | TIMEZONE_MINUTE } | { TIMEZONE_REGION | TIMEZONE_ABBR } FROM { date_val...
datetimeDATE、TIMESTAMP、TIMESTAMP WITH TIME ZONE、TIMESTAMP WITH LOCAL TIME ZONE、INTERVAL YEAR TO MONTH、INTERVAL DAY TO SECOND等数据类型的值。 说明 如果指定提取YEAR或MONTH,则datetime数据类型为DATE、TIMESTAMP、TIMESTAMP WITH TIME ZONE、TIMESTAMP WITH LOCAL TIME ZONE或INTERVAL YEAR TO MONTH。
Oracle的EXTRACT函数用于从日期/时间表达式中提取指定的部分,比如年、月、日、小时、分钟等。其基本语法如下: EXTRACT(unit FROM date_expression) 复制代码 其中,unit表示要提取的部分,可以是以下值之一: YEAR MONTH DAY HOUR MINUTE SECOND 例如,要从一个日期列中提取年份,可以这样使用EXTRACT函数: SELECT EXTRACT(...
In this example, we used theTO_DATE()function to convert a date literal to aDATEvalue. Here is the result: Similarly, you can extract the values of other fields as shown below: Extracting month from a date: SELECTEXTRACT(MONTHFROMTO_DATE('31-Dec-1999 15:30:20 ','DD-Mon-YYYY HH24:...
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...
SQL> select extract(month from sysdate) as "month" from dual 2 / month --- 8 3. 获取当前日期中的日 SQL> select extract(day from date'2012-12-28') as "day" from dual 2 / day --- 28 分类: Oracle 0 0 « 上一篇: VI 编辑器保存命令 » 下一篇: Oracle 身份验证方式 pos...
EXTRACT(): return a year, month, day, hour, minute, second, or time zone from x : EXTRACT « Date Timezone « Oracle PL / SQLOracle PL / SQL Date Timezone EXTRACT EXTRACT(): return a year, month, day, hour, minute, second, or time zone from x...
動的パフォーマンス・ビューの詳細は、『Oracle Databaseリファレンス』を参照してください。 例 次の例では、oe.orders表から、各月の注文数を戻します。 SELECT EXTRACT(month FROM order_date) "Month", COUNT(order_date) "No. of Orders" ...