when($"tc" === "a" && $"amt" >= 0, "N") .when($"tc" isin ("a", "b"), "Y")
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...
OR ） CASE WHEN sex = ‘1’ THEN ‘男’ WHEN sex = ‘2’ THEN ‘女’ ELSE ‘其他’ END...
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。 相关优势 SUM: 可以快速计算某一列的总和,适用于统计分析。 CASE WHEN: 可以在 SQL 查...
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....
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. ...
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 ...