只可以从一个date类型中截取年月日 SQL>selectextract (yearfromsysdate)year,extract (monthfromsysdate)month,extract (dayfromsysdate)dayfromdual;YEARMONTHDAY--- --- ---201554 只可以从一个date类型中截取年月日 SQL>selectextract (yearfromdate'2015-05-04')year, extract (monthfromdate'2015-05-04'...
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(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...
This Oracle tutorial explains how to use the Oracle/PLSQL EXTRACT function with syntax and examples.Description The Oracle/PLSQL EXTRACT function extracts a value from a date or interval value.Syntax The syntax for the EXTRACT function in Oracle/PLSQL is: EXTRACT ( { YEAR | MONTH | DAY | ...
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'),EXTRACT(DAYFROMNOW())\...
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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'),EXTRACT(DAYFROMNOW())\...
For example, in Google BigQuery, you can specify DAYOFWEEK to find out the day of the week. This is not available in Oracle or MySQL. Please note that component_part needs to align with the data type of expression. For example, if you try to extract the hour from a DATE expression,...
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...
In ambiguity case for the combinations of date-time field and interval value expression, Oracle returns UNKNOWN as a result. Syntax EXTRACT(Component FROM [Date_time or Interval_valueexpression]) Components are:Year, Month, Day, Hour, Minute, Second, Timezone_hour, Timezone_minute, Timezone_re...