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 --- 2012 2. 获取当前日期中的月份 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...
SELECT c.customer_id, c.customer_name FROM customers c WHERE EXISTS ( SELECT 1 FROM orders o WHERE o.customer_id = c.customer_id AND EXTRACT(YEAR FROM o.order_date) = EXTRACT(YEAR FROM SYSDATE) - 1 ); 在这个例子中,EXTRACT函数用于确定订单日期是否在过去一年内,而EXISTS子句则用于检查...
EXTRACT (component_part FROM expression)where the data type of <expression> is some type of date, time, or datetime. <number> is an integer (can be positive or negative). Common <component_datepart> can be one of the following: YEAR MONTH DAY HOUR MINUTE SECOND...
EXTRACT(unit FROM date) 是一个标准 SQL 函数,用于从日期或日期时间表达式中提取指定的时间单位(如年、月、日、小时等)。它在数据分析、报告生成、时间序...
Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i Example Let's look at some Oracle EXTRACT function examples and explore how to use the EXTRACT function in Oracle/PLSQL. For example: EXTRACT(YEAR FROM DATE '2003-08-22') Result: 2003 EXTRACT(MONTH FROM DATE '2003-08-22') Result: 8 EXTRA...
EXTRACT(unitFROMdate) 说明 以整数类型返回date的指定部分值。如果指定多个部分,则将所有值按顺序拼接。 有关参数unit的详细信息,请参见DATE_ADD。当unit为WEEK时,以周日为每周第一天。 示例 obclient>SELECTEXTRACT(WEEKFROM'2013-01-01'),EXTRACT(WEEKFROM'2013-01-06'),EXTRACT(YEAR_MONTHFROM'2012-03-09'...
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。
SELECT YEAR(CURRENT_TIMESTAMP); The above returns “2022” as we expected. SQL Datepart Function You can also use the datepart function to get the year from a date. This function feels closely similar to the extract function in Standard SQL. ...
Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i Pictorial Presentation Examples: Oracle EXTRACT (datetime)() function The following example returns the year 2015. SQL> SELECT EXTRACT(YEAR FROM DATE '2015-03-03') FROM DUAL; Sample Output: ...