select day("2020-12-20"); 2)dayofweek(1 = Sunday, 2 = Monday, ..., 7 = Saturday)、dayofyear -- 7 select dayofweek("2020-12-12"); 3)weekofyear(date) /** * Extracts the week number as an integer from a given date/timestamp/string. * * A week is considered to start on a ...
Examples:> SELECT add_months('2016-08-31', 1); 2016-09-303.last_day(date),next_day(start_date, day_of_week)Examples:> SELECT last_day('2009-01-12'); 2009-01-31> SELECT next_day('2015-01-14', 'TU'); 2015-01-204.date_add,date_sub(减)date_add(start_date, num_days) -...
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 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", ...
2.2 sparkSQL 内置函数 2.2.1 上一个自然周 经过不断探索找到了 next_day,spakr 1.5就有的函数 next_day(start_date, day_of_week) - Returns the first date which is later than `start_date` and named as indicated. The function returns NULL if at least one of the input parameters is NULL....
假如表按照day_of_week字段分区,那sql应该是将filter下推,先过滤,然后在scan。 这就是传统数据库存在索引及预计算的时候所说的谓词下推执行。 2.动态分区裁剪场景 Spark 3.0的分区裁剪的场景主要是基于谓词下推执行filter(动态生成),然后应用于事实表和维表join的场景。
import org.apache.spark.sql.functions._ import org.apache.spark.sql.types.DateType // 读取数据 val df = spark.read.format("csv").option("header", "true").load("data.csv") // 将日期列解析为日期类型 val dfWithDate = df.withColumn("date", to_date(col("date"), "yyyy-MM-dd").ca...
计算是本年的第几周,那么sparksql 如何写 ? 二、分析 难点: Spark SQL 的 DAYOFWEEK 函数返回的每周第一天是周日。 边界值的处理,即第一周如何判定、第二周从哪天开始计算。 对应的伪代码 intday_of_week(intday){if(day==7){return1;}else{returnday+1;}}dayofyear=DAYOFYEAR(your_date_column)if(dayo...
spark数据库sql日期格式 spark 日期 一、hive 1、日期 (hive没有date类型) 1)、获取时间 current_date 2019-05-07 current_timestamp/now() 2019-05-07 15:20:49.247 2)、从日期时间中提取字段 year(''),month(''),day/dayofmonth,hour(''),minute(''),second(''),dayofweek(),dayofyear(),weekof...
case when day_of_week('$date_value') = 7 then date_value else next_day('$date_value', 'sunday') end --- 结果是这天所在周的周结束时间