date_part函数是 SQL 标准extract函数的同义词。 例如,date_part('year', CURRENT_DATE)等效于extract(YEAR FROM CURRENT_DATE) 示例 SQL复制 >SELECTdate_part('YEAR',TIMESTAMP'2019-08-12 01:00:00.123456'); 2019 >SELECTdate_part('Week',TIMESTAMP'2019-08-12 01:00:00.123456'); 33 >SELECTdate_...
DATE_PART函数: DATE_PART函数用于从日期或时间字段中提取特定部分的值,比如年、月、日、小时、分钟等。语法如下: SELECT DATE_PART('year', '2022-01-01'); 复制代码 这将返回2022,表示提取出了年份部分的值。 因此,DATEDIFF主要用于计算日期之间的天数差,而DATE_PART用于从日期或时间字段中提取特定部分的值。
selectdate_part('year',endTime)-date_part('year',startTime) 示例: selectdate_part('year',to_date('20241201','yyyyMMdd')::TIMESTAMP)-date_part('year',to_date('20230201','yyyyMMdd')::TIMESTAMP) 输出:1
It converts date format into SQL DATEPART () – Returns a single part of a date/time DATEDIFF () – Returns the current date and time SQL Date Data Types For storing date and time, the different data types are: DATE – in YYYY-MM-DD format in SQL YEAR – in YYYY or YY format ...
注:$2指第二个parttern位对应元素 替换字符-将string中符合pattern的元素替换为function结果 : regexp_replace(string, pattern, function) → varchar eg:SELECT regexp_replace('new york', '(\w)(\w*)', x -> upper(x[1]) || lower(x[2])); --'New York' ...
Returns the year part of a datetime string. year(Date) For example, year("1970-01-01") returns 1970. YEAR("2000/1/1") You are advised to use theYEARfunction inNew Calculation Columnof FineDataLink. Returns the quarter of the given datetime as an integer. ...
Visual Presentation of PostgreSQL DATE_PART() function Example 1: PostgreSQL DATE_PART() function The example below finds the hour part from the timestamp (date and time specified in the argument) . SQL Code: SELECT date_part('hour', timestamp '2002-09-17 19:27:45'); ...
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The DATETRUNC function returns an input date truncated to a specified datepart.Syntaxsyntaxsql Kopiraj DATETRUNC ( datepart , date ) ArgumentsdatepartSpecifies the precision for truncation. This table lists all the valid datepart values for DATETRUNC, given that it's also a valid part of the ...
$SYSTEM.SQL.Functions.DATEPART(datepart,date-expression) 提供DATEPART是为了与Sybase和Microsoft SQL Server兼容。 Datepart 参数 日期部分参数可以是下列日期/时间组件之一,可以是全名(日期部分列)或其缩写(缩写列)。这些datepart组件名称和缩写不区分大小写。 Date PartAbbreviationsReturn Values 上表显示了不同日期部分...