3.weekofyearweekofyear(date) - Returns the week of the year of the given date. A week is considered to start on a Monday and week 1 is the first week with >3 days.Examples:> SELECT weekofyear('2008-02-20'); 84.trunc截取某部分的日期,其他部分默认为01第二个参数 ["year", "yyyy...
月份的边界:不同的月份有不同的天数,如一月有31天,二月通常有28天,等等。 Spark SQL日期函数 Spark SQL提供了多种处理日期的函数。我们需要使用的主要函数有: date_format(date, format): 将日期格式化为指定格式。 weekofyear(date): 返回一年中的第几周。 last_day(date): 返回某个日期所在月份的最后一天。
GROUP BY date_format(time, 'yyyy-MM'); 二、平均周活: WITH week_user_cnt ( SELECT date_format(time, 'yyyy') AS current_year, date_format(date_trunc('WEEK', time), 'MM') AS current_month, weekofyear(time) AS current_week, COUNT(DISTINCT user_id) AS active_users FROM table GROUP...
weekofyear(date) - Returns the week of the year of the given date. A week is considered to start on a Monday and week 1 is the first week with >3 days. Examples:> SELECT weekofyear('2008-02-20'); 8 4.trunc截取某部分的日期,其他部分默认为01 第二个参数 ["year", "yyyy", "yy...
3)weekofyear(date) /** * Extracts the week number as an integer from a given date/timestamp/string. * * A week is considered to start on a Monday and week 1 is the first week with more than 3 days, * as defined by ISO 8601 ...
推荐使用 FineDataLink新增计算列中的公式DATE(YEAR(日期),MONTH(日期)+1,1-1),详情参见:常见日期公式 使用SparkSQL 函数trunc(string date, string format):返回时间的最开始年份或月份。 示例:select trunc("2016-06-26","MM"),trunc("2016-06-26","YY") ...
1.year,month,day/dayofmonth,hour,minute,second Examples:> SELECT day('2009-07-30');30 2.dayofweek (1 = Sunday, 2 = Monday, ..., 7 = Saturday),dayofyear Examples:> SELECT dayofweek('2009-07-30'); 5 Since: 2.3.0 3.weekofyear ...
>>> test_df.select("date_days", Weekofyear( "date_days").alias("Week of the year")).show(3) 7) **Date_sub(start, days)**→ 从日期字段中减去天数。 例子: >>> df.select('Fly_date', date_sub(df.Fly_date,3).alias("date_sub")).show(3) ...
Microsoft.Spark.Sql Assembly: Microsoft.Spark.dll Package: Microsoft.Spark v1.0.0 Extracts the week number as an integer from a given date/timestamp/string. C# publicstaticMicrosoft.Spark.Sql.ColumnWeekOfYear(Microsoft.Spark.Sql.Column column); ...
本篇文章主要介绍SparkSQL/Hive中常用的函数,主要分为字符串函数、JSON函数、时间函数、开窗函数以及在编写Spark SQL代码应用时实用的函数算子五个模块。 字符串函数 1. concat 对字符串进行拼接:concat(str1, str2, ..., strN) ,参数:str1、str2...是要进行拼接的字符串。