when($"tc" === "a" && $"amt" >= 0, "N") .when($"tc" isin ("a", "b"), "Y")
OR ） CASE WHEN sex = ‘1’ THEN ‘男’ WHEN sex = ‘2’ THEN ‘女’ ELSE ‘其他’ END...
SQL Case when 的使用方法 Case具有两种格式:简单Case函数和Case搜索函数。 简单Case函数###CASE sex WHEN '1' THEN '男' WHEN '2' THEN '女' ELSE '其他' END Case搜索… Amily发表于菜鸟学编程 简述SQL中的case when语句 学习交流,欢迎留言 今天学...
AnalysisException: Sparksql - SUM with CASE WHEN基础概念 AnalysisException 是Apache Spark SQL 中的一种异常,通常在查询执行期间发生,表示查询分析阶段出现了问题。SUM 是一个聚合函数,用于计算数值列的总和。CASE WHEN 是一个条件表达式,用于在 SQL 查询中进行条件逻辑处理。
Case When 方法 第一个查询结果:如果B表的age有值则取B表中的age。如果没有值则去A表中的age 第二个查询结果:如果A表的age有值则取A表中的age。如果没有值则去B表中的age sqlContext.sql("select A.age AS Aage , AS Aname,B.age AS Bage , AS Bname from (select * from people01 ) A left...
spark dataframe 里for 循环 spark dataframe case when,一、SparkSQL简介SparkSQL是Spark中的一个子模块,主要用于操作结构化数据。它具有以下特点:能够将SQL查询与Spark程序无缝混合,允许您使用SQL或DataFrameAPI对结构化数据进行查询;支持多种开发语言;支持多达上百
read.json("/opt/module/spark-local/people.json") df: org.apache.spark.sql.DataFrame = [age: bigint, name: string] 2)创建一个样例类 scala> case class Person(name: String,age: Long) defined class Person 3)将DataFrame转化为DataSet scala> df.as[Person] res5: org.apache.spark.sql....
Like SQL "case when" statement and Swith statement from popular programming languages, Spark SQL Dataframe also supports similar syntax using "when otherwise" or we can also use "case when" statement.
* `spark.sql.columnNameOfCorruptRecord`): allows renaming the new field having malformed string * created by `PERMISSIVE` mode. This overrides `spark.sql.columnNameOfCorruptRecord`. * `multiLine` (default `false`): parse one record, which may span multiple lines. * `locale` (default is ...
For example, they make it easy to compute multiple aggregates in one pass using a SQL statement, something that is difficult to express in traditional functional APIs. They also automatically store data in a columnar format that is significantly more compact than Java/Python objects. ...